Linear loaded vertical antenna. So my portable antenna needs no guy ropes and covers 3.

Linear loaded vertical antenna I was thinking about the following method: It is based on the fact that the current distribution in the antenna is sinusoidal; it radiates more in the An "umbrella antenna" is basically just a vertical monopole antenna that is top-loaded with a large "end-hat". One sets the total length by some external constraint, then chooses the location of the cut to optimize some aspect of the antenna behavior. " Coils have loss, it's true, but so does EVERY loading scheme, even if it just looks like "some wires. Because all forms of NEC have difficulties with very small angles between wires that join, a model was made of a set of parallel wires with cross wires. There is certainly lots of information on optimizing mobile verticals. Linear top-loaded model 35LH1030 17. According the the ARRL Antenna Handbook, linear-loading introduces little loss and has a low Q, which allows good bandwidth (up for debate by a few). The needed inductive reactance value is given by the difference in reactance between points “A” and “B” in Figure 1. wordpress. This Vertical antenna design by David Reid for lower bands focuses on achieving effective DX communication by optimizing the antenna low-angle radiation for long-distance contacts. Shunt Matching Coil. With material left over from my base-loaded designs, I have decided to make a center-loaded vertical for 80 mtrs. 5' load, Specifications for antenna at bottom of diagram Specifications This is a vertically and horizontally polarized antenna the Linear loaded 1/4 wave length vertical radiator introduces very little loss. But as you increase H1 and reduce H2, the required loading method is used on a number of commercial beam antennas, but, as far as I know, only Gap use linear loading on their verticals. Page update of 7 August 2019. Super-Sloper Antenna. 160m Loop Antenna for TX. Here are the other videos in my Linear Loading journey: 160 Meter linear loaded Tee vertical doublet antenna; Ultra-portable 5ele 144MHz Pocket Portable Yagi; 6 Meter Halo Antenna Design; 5/8 Collinear antenna; The ZS6BKW Multiband HF Antenna; Step-By-Step Construction of a 4:1 Current If you would like to make a linear loaded vertical antenna, you may want to have a watch of this to save the mistake of perhaps buying the wrong pole first t EZNEC antenna description files. 7 This antenna was a surprising performer. Ideal for limited space. This is another reason to attempt to design and build one. Without Radials . Made about 30 out of 40 contacts with it that night (the remainder using a ground-mounted vertical). You could move the loading coil all the way to the top, for maximum Build a portable linear-loaded dipole NVIS antenna for 40 meters, capable of reaching stations 150 km (nearly 100 miles) away, or more. Antennas: 40M: 40 Meter Vertical Antennas. The antenna should exhibit a true vertically-polarized circular radiation pattern. Base lumped-constant loaded antenna 35LLxxxx. The antenna is base-loaded with a coil and has a radial for improved performance. Base linear-loaded antenna 35LHxxxx. Sign in Product GitHub Copilot. END-HAT ADDED TO MY 2. A linear loaded vertical antenna This Vertical antenna design by David Reid for lower bands focuses on achieving effective DX communication by optimizing the antenna low-angle radiation for long-distance contacts. Navigation Menu Toggle navigation . VSWR = 1:1 on all bands. 65 MHz 3. 220 MHz on a My 80 m short vertical antennas with base-loading are described on this page. 813 Linear Amplifier; FT1000MP Third Order IMPs; Causality – Why Inductors are lossy; Similarly, the RSGB’S Practical Wire Antennas2 and Practical Wire Antennas 23 offer suggested broadband configurations. 6x1. 160 Meter linear loaded Tee vertical doublet antenna; Ultra-portable 5ele 144MHz Pocket Portable Yagi; 6 Meter Halo Antenna Design; 5/8 Collinear antenna; The ZS6BKW Multiband HF Antenna; Step-By-Step Construction of a 4:1 Current-Type Balun; HF Log Periodic Antenna; Antenna dipole of NOT hanging a heavy coaxial feeder from a long span of thin antenna wire, has rekindled interest in end-fed half-wave antennas. [1. Helicals do work but tend to have negative gain, often -2 to -4db. 160m and 80m Morgain-Dipole Antenna. High Performance 40 Meters Vertical . As a lot of you will appreciate, to work good DX requires a low angle of radiation from the antenna. In June of 2010, I decided to add an end-loading "hat" to my 2. It needs a ground plane with very good conductivity. A similarly designed, remotely tuned 160 meter inverted L ground plane was also erected. The ARRL Antenna Book has a short section on linear loading. The only lim-iting aspect to the antenna is the space, or span, required to support it. long, but it easily tunes up on 80m. Antenna projects for 80 meters band category is a curation of 184 web resources on , 80/75 Meter 4-Square Array, The CN2WW 80m wire-beam, The Hudson antenna. 020 MHz. The 25m long antenna described here will get you on air without an ATU on 80m, 40m, 20m, 15m & 10m. 8 9. How start: When I was amateur radio I looking for a high efficiency antenna which need limited space on eighty meters band. Because of limitations in modeling linear-loaded antenna structures, the calculations are as good as the model as a guide to building. 89 . 160m Linear Loaded Sloper Antenna. 6' from the antenna top downward at a top spacing of 3' from the main element. The antenna is made of a quarter wave vertical with a reflector, that goes diagonally down from the top and Another interesting and surprising antenna is the vertical doublet. 9 thoughts on “Linear loaded short dipole” Pingback: 9V1KG – Klaus & Lita. 050 - 3. 4 is that the 80m element is fully vertical and top loaded via a small linear loaded section for fine tuning, giving you better night-time DX capability. 4m radials. 6 MHz 3. Loading Coil 30 inches long Diameter 0. The telescopic antenna can be physically extended or retracted to get resonance at any frequency between 14. 75 - 160m Inverted Delta Loop. 05 λ) above ground level. One way to do this is to use the linear loaded koncept. 5 m The Single Element loaded vertical (left) has a loading coil inserted at the base of the antenna element. 5 MHz 3. ez Linear loaded dipole (28. Inputs via the slider widgets: f : The frequency of operation in MHz. Designed and produced in Scotland this antenna is a “linear loaded vertical antenna” and is designed by Colin MM0OPX. In Texas, I used a 32 ft vertical doublet and fed it with 300 ohm ladder-line. This is an article on the design of my Linear loaded vertical antenna for 40/80M - I hope to have it published in print soon. Figure 3-1 identifies the structural and electrical elements of a contemporary linearly loaded vertical antenna. The design incorporates techniques like linear loading and capacity hats to Made a fine dummy load. From the verticals which justifies the addedcomplexity of a top hat"? After all, we could put up a simple - vertical and load it with an inductor as is done for mobile antennas. the performance of a helically wound vertical antenna, mounted immediately above a ground plane, top- capacitance-loaded with a vertical rod or whip. Calculations of triangular linear load elements correspond in the main with models of fully structured antennas within about 2 to 3 percent. 000 MHz and 29. But this is problematic in that, the 1. 3 WB0NNI 40 Meter Linear Loaded Vertical K5OE Antennas -- HF Antennas 40/80/160 55 ft Vertical St. It even loaded well on 40 meters with a balanced tuner, and did a respectable job. I changed the antenna configuration again - just for fun and out of curiosity. I tried two configurations, both only 1-1½ m (3-5 feet) above the terrace floor. Resources listed under Antennas for 80 meters band category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. 700MHz. 7 MHz 35LL1015 SWR 9. 2 and 4. If your local noise level is low, this is something to consider. 7 3. Because of the very poor form factor, most linear loaded systems have Q's in the double digits. 70 - Super-Sloper Antenna. Linear Loaded Wire Antennas I have done a lot of research on wire antennas on the internet as well as other places and developed aninterest in linear loading: Loop Antenna Info I have personally used a 160 meter band Horizontal Full Wave Loop antenna with very good success. 3 show efficiency as the coil is moved Moving the inductor higher into a heavily top-loaded vertical has less effect on the current distribution. I have never seen a home brew linear loaded vertical design published. Paulo, CT2IXW says: 2016-10-23 at 5:32 am. When compared to a horizontal doublet at 19 feet above ground (neighborhood constraints), the vertical was superior for DX on 20 meters. Please wait while The 160 meter loaded vertical antenna is constructed using an inexpensive telescopic fiberglass fishing pole 10m in length. " The loss of the wire in a linear loaded antenna is NOT the same as the loss in the same wire stretched out Antenna 160 meter Links → . Learn how to build a short vertical antenna for the 80 m band using a 3-conductor wire in a "Cobra" configuration. 5 m (8 ft) base-loaded vertical, and see what happens. I tried to put this whole thing on the current spreaders with the feed point in the middle and half the ground side linear loaded as well, on the same mast. Includes several antenna projects you can build yourself! $\begingroup$ My take on "linear loading" - it's just a shorted transmission line, a low-loss low-cost inductor. 8 to 2. 5 M (8 FT) BASE LOADED VERTICAL. 74 - Collinear Array Antenna for 40m, 30m, 20m. 6 MHz] l : Length in percent compared to a half-wave dipole. The linear loaded voltage fed Tee Vertical antenna places the highest current point at or near the top of the support structure gaining the following advantages. The limitations I had were the available sizes of aluminium tubing which would stand A Linear Loaded Vertical Antenna 1998 for 40M and 80M. [10-100 %] d : Distance of the coil/inductor from 69 - Linear Loaded Sloper Antenna for 160m 70 - Super-Sloper Antenna 71 - Tower Pole as a Vertical Antenna for 80m 72 - Clothesline Antenna 73 - Curtain Zepp Antenna for 160m, 80m, 40m 74 - Collinear Array Antenna for 40m, 30m, 20m 75 - 160m Inverted Delta Loop 76 - Half Rhombic Unidirectional Vertical for 20m to 6m 77 - Capacitance Loaded Vertical Antenna for 160m 78 - A Coaxial Cable Vertical Dipole Antenna A Wideband Dipole for 75 and 80 Meters The K4VX Linear-Loaded Dipole for 7 MHz. 3: linear-loaded antennas; Ref. An "umbrella antenna" is basically just a vertical monopole antenna that is top-loaded with a large "end-hat". The vertical gain of a dipole rapidly decreases at heights less than 0. 144 / 430 Dual Band J-pole antenna; 10 Meter 4 Element Quad Antenna; 144 Mhz Magnetic Loop Antenna; A “loopy” Loop Loaded Vertical; W5GI Mystery Antenna; A Multiband Dipole; Build a W3DZZ Antenna; A portable 2-element VHF yagi; Assembling GAP Titan DX Antenna; The Galaxy Dipole; Pfeiffer Maltese Quad For vertical polarization on 80 for the “run” rig, I designed and built a remotely tuned elevated ground plane that could be used anywhere in the band with an SWR very close to 1:1. It has been purposely reduced in length compared to a full sized 80m dipole by the insertion of a 70uH loading coil Antenna 160 meter Links → . 3A: "The "Cobra" antenna", by [ Marquette, MI] This is an update of my original vertical doublet design. 55 MHz 3. The hat consists of a number of radial wires that slope away, downward from the top of the antenna. You could move the loading coil all the way to the top, for maximum efficiency. 1998 David Reid PA3HBB / G0BZF. It is not "lossless linear loading", as some Linear loaded antennas. 80 meters band linear loaded dipole. Louis Vertical-- By Dave Gauding, NF0R DDRR - for 40M -- Directional Discontinuity Ring Radiator Antenna 40M Beam -- From QRZ 40M Triangular Full-Wave Vertical Loop Antenna -- This massive antenna is unrivalled by any other antenna on the market and stands at a massive 59 feet tall! The advantage of the eXtreme Nebula over the standard Classic or the Signature 12. I worked all 50 states and several Center-insulator with temporary BNC adapter. The antenna is installed horizontally. Special bonus section by Jackson R. I always wanted to try linear-loading this vertical doublet to make it more useful as a DX antenna on 30, 40 and possibly 80 meters, but never got to it until now. 76 - Half Rhombic Unidirectional Vertical for 20m to 6m. Skip to content. Using the height and radius of the main antenna element, one calculates the average characteristic impedance, treating the antenna as a one-wire transmission line. ; After this, you can also calculate the 69 - Linear Loaded Sloper Antenna for 160m. It is possible Tried the antenna in the SCC RTTY contest August 26, 2006, and had a hard time working anyone with any antenna, so the verdict isn't in yet. Clothesline Antenna. My antenna is only 73-ft. It has been purposely reduced in length compared to a full sized 80m dipole by the insertion of a 70uH loading coil. 1 λ (3 dB loss at 0. Almost any For better efficiency, a Double Element loaded vertical (right) could be used. I wanted high efficiency 40 Meter antenna with low-angle radiation. com/2020/08/02/linear-loaded-vertical-antenna-antenna-lampion/ Half-Length 80-Meter Vertical Monopoles: the Best Method of Loading L. 550 Picture 1 - Linear loaded dipole 3. Before choosing how we must first state why we are doing it. At my QTH my 1/4 wave inverted L noise level was always S9 to +5 over. The design incorporates techniques like linear loading and capacity hats to reduce the antenna's height while maintaining If you would rather calculate the length of a full-size vertical antenna, Off-Center Loaded Dipole Antennas, QST magazine, September, 1974; Coil-Shortened Dipole Antenna Calculator; Home: Check out the recommended Homepage van Maarten Ouwehand PG1N. 4 Various broadband designs can be found in the ARRL’s Wire Antenna Classics5, More Wire Antenna Classics6 and Simple and Fun Antennas. 50 Ohm Coax Feed. I have used a griddip meter to adjust the lengths of the stubs to obtain the demanded frequency. 160m Inverted-L. This happen because my neighbourhoods don't leave me to prop a simple wire. . It has gain and wave angle comparable to a full-sized ¼λ ground plane antenna with radials . One of the easiest antennas to build is the half-wavelength dipole fed with coax. 72 - Clothesline Antenna . You're free to put differently tuned elements in parallel, whether they're different lengths or differently loaded, and it helps with bandwidth, to a point. 5 MHz) (Due to the usual need for large diameter main elements and smaller loading elements, 2lsq2l10. Antenna 40 Meter Links → Test pada Frekuensi 6. 6 m wide balcony available for antennas. The vertical antenna looks to be the perfect low angle radiator, except for one thing the height of a 1/4 l at 80 metres is 20 metres, or 66 feet, which is not practical to construct. I have a section of 1. 950 - 7. Over several decades, Barry Booth (W9UCW) and a group of fellow hams, Ref. 73 - Curtain Zepp Antenna for 160m, 80m, 40m. There is some debate if you actually require a Choke Balun on a ground mounted vertical. I used one for many years in Texas (without radials) mounted just a couple feet off the ground. My own reasons are, for the low HF bands, I also included end-hat loading in my 8 mtr (26 ft) mid-loaded wire vertical. A Linear Loaded Vertical antenna for 40mt and 80mt ,PA3HBB: A Shortened 7 mHz Dipole, GM4JMU: Adding 30 and 40 meters to the 4 Element SteppIR, WD0M: Antena multibanda G5RV: Antenne fuchs pour le 40m a mon domicile, F6BQU: Antenne verticale monobande 7Mhz, F1RFM: Balanced Terminated Folded Dipole, W7CIA: Capacitive Antennas 7. Note that if the Hidden and stealth antennas; Antennas . The following codings distinguish among antenna types: "Capacity" hat vertical monopole 35BLxxxx(A). o Hidden and stealth antennas; Antennas . Why a vertical antenna?. 160m, 80m, 40m Curtain Zepp Antenna. I've been thinking about linear-loading this type antenna, but haven't followed-through. Linear loaded antennas don't suffer near the loss but need a bit more space. Creation date : 11/08/2007 @ 19:11 Last update : 17/09/2024 @ 23:32 Category : Multiband HF Projects Page read 63584 times All short, loaded vertical antennas on 160 or 80m tend to have a low impedance, and higher SWR. We’ve featured this antenna a little before and now back with the website and more details. It is strongly recommended that a high voltage handling parallel network matching device be used to load up the linear loaded voltage fed Tee Vertical antenna. 8-57. ez Square quad beam with 2 linear 80m Linear Loaded Vertical – Stainless Steel Wire. 160m Inverted Delta Loop. As a result efficiency improvements are much smaller. Linear-Loaded Vertical Doublet (Dipole) [ Marquette, MI] This is an update of my original vertical doublet design. 160 meter linear loaded voltage feed T 160 meter linear loaded voltage fed T antenna All model file names begin with 35 to indicate an 80-meter vertical antenna. Any horizontally-polarized field component should be sufficiently small that it does not affect the overall antenna field shape or strength. While linear loading provides wide bandwidth, it also adds needless resistive losses. This page looks at vertical antennas that are shorter than 1/4 λ, for any particular frequency. 160m Twisted Loop Antenna. I have the same problem. post 25 Dec 2024. Your result will consist of: Your total antenna length (L);; Length of one arm of the antenna (l); and; Wavelength, as well as its portions: 1/2, 1/4 (it'll also allow you to use it as a 1/2 wave dipole calculator). 5MHz to . Without a clear purpose to the exercise there can be no clear approach to take. The elevated highest current point of the antenna is above allot of the local vertically polarized noise field. Includes several antenna projects you can build yourself! Also available: HF Dipole Antennas for “Broad-banding a 160 m Vertical Antenna” by Grant Saviers, KZ1W “Inductively Loaded Dipoles” “Off-Center Loaded Antennas” by Jerry Hall, K1PLP “The 3/8-Wavelength Vertical — A Hidden Gem” by Joe Reisert, W1JR “The 160-Meter Sloper System at K3LR” by Al Christman, KB8I, Tim Duffy, K3LR and Jim Breakall, WA3FET also apply to a loaded vertical antenna. We know that for a lossless antenna the radiation pattern of a very short vertical is almost the same as a . This shortened easy-to-build vertical, with no-radials, is made from surplus military camouflage poles. Well I find a way to solve my problem. After moving to temporary accommodation back in the UK, I decided to get back on the air and blow the cobwebs off the Worse of all, antenna manufacturers and antenna builders tend to under-state or under-estimate loss in other forms of loading, specifically linear-loading. 5 1. 78 inches (20mm) 10 Meter Telescopic Pole. Cebik, W4RNL (SK) The overall length of the 4-wire zigzag assemblies may be compared with the length of the single top linear load: 17. This antenna was a surprising performer. I worked all 50 states and several In order to use our antenna calculator, you'll need to know the frequency on which you want your antenna to operate. BETTER: Here (below) is a recording that VA3BLV made on October 10, 2022 at 01:11 UTC (recorded off KiwiSDR software-defined receiver in Jumonville, PA, Grid FM09dw), while I was using your 40 meter linear-loaded antenna design on 7. I selected the one shown below, which would shorten the overall length of the antenna the most. Linear-loaded 40 Meter Vertical Dipole There are many ways to shorten antennas. B. The Marconi radiator is resonant to any odd multiple of a quarter-wave length. The illustration also reflects the model used to test these antennas. Semi-vertical trap antenna The G3NGD Semi-vertical Trap Antenna for 1,8 3,5 and 7MHz EH antenna for 160 mt by Iz7ath EH antenna for 160 mt: my experiment and comparison with a short vertical. Richter, WBØUSA, features a thorough discussion about how these popular multiband antennas function. So my portable antenna needs no guy ropes and covers 3. There are a couple ways to linear-load an antenna. The issue is addressed in Les Moxon’s HF Antennas For All Locations. 160m Capacitance Loaded Vertical Antenna. Contribute to Kees-PA3KJ/EZNEC_Files development by creating an account on GitHub. for 40M and 80M ©1998 David Reid PA3HBB / G0BZF. If the SWR of this antenna is too high for your transceiver or linear, the easiest solution is to simply use a matchbox in the shack. Every ARRL Handbook since 1930 contains the information re-quired for constructing one. To keep the antenna resonant as the coil is moved up its impedance (XL) must be increased, 3411Ω → 6487Ω. 4 MTR (13 FT) VERTICAL MONOPOLE WITH SINGLE ELEVATED RADIAL. 0 MHz $\begingroup$ My take on "linear loading" - it's just a shorted transmission line, a low-loss low-cost inductor. The 132 ft On topband, the feeders must be strapped and the whole antenna fed against earth as a top-loaded vertical. Useful for multi-band antennas because it changes over freq differently to a real inductor. That antenna has a fine-tuning bolt that is screwed into the threaded tip of the radiator. My antenna supported in it's wooden box, ready for portable operation. This is often the simplest and sturdiest situation, but it is also the least efficient. Defaults to 80% of a half-wave dipole. Reels – Wide arbor Fly Fishing reel spools. Below you can find The Marconi antenna is usually defined as a vertical wire with a length of 1/4 of the working wavelength, fed through its lower end. By using 450 ohms ladder lines as stubs the construction is a piece of a cake. The location of the piece and its length are both design choices. 71 - Tower Pole as a Vertical Antenna for 80m. It's a lot quieter than the vertical. A linear loaded vertical antenna By PA3HBB. I this is a vertically and horizontally polarized antenna the linear loaded 1 4 wave length vertical radiator introduces very little loss for 80 or 160 meters. I. New Photo of my 80M version. The centre of the antenna droops alarmingly even with light-weight feeders. By John Portune W6NBC . This antenna is simply the top half of the center-loaded vertical mini-dipole shown above, but this time loaded with a Slinky ® coil counterpoise below it. It even loaded well on This loaded dipole antenna calculator was developed to quickly estimate the inductance required for a coil-loaded dipole antenna, using slider widgets. Center-insulator with temporary BNC adapter. 0 3. When space is limited one has to design and build shortened antenna. But, Using the Tee Vertical antenna as a multi-band antenna on 80-10 I’ve had very good results. Listed under the Antennas/160M category that is about Antenna for 160 meters band. I think hams have been fed a load of nonsense from antenna marketing departments that claim that their design has "no lossy coils. For my amateur radio activities on the HF bands I only have a 3. Lihat artikel : https://jagawana80m. Top Zig-Zag loaded antenna 35VZxxxx. Picture 2 shows my dipole antenna, Another relatively easy made antenna is the flagpole vertical. Height helps a great deal This classic rule will also never change. The over all radiation efficiency is high at 80% to 85%. A horizontally polarized antenna would be needed for the “run” rig for good coverage on 80 meters, however EZNEC antenna description files. Top Fed Linear Loaded 3/4 wave length Vertical for 80 meters by KE4UYP A Linear Loaded Vertical antenna for 40mt and 80mt. Cebik, W4RNL Summary In the pursuit of obtaining the most compact and efficient 80- meter monopole antenna, numerous loading schemes have been proposed, including based lumped constant loading, base linear loading, top (capacity) hat loading, and a number of antenna element extension-and-fold Because transmission lines are inherently high Q structures, we should expect base linear loaded models to exhibit a narrow operating bandwidth. It says that linear loading is a “little understood” alternative to inductive loading that can be In Texas, I used a 32 ft vertical doublet and fed it with 300 ohm ladder-line. 144 / 430 Dual Band J-pole antenna; 10 Meter 4 Element Quad Antenna; 144 Mhz Magnetic Loop Antenna; A “loopy” Loop Loaded Vertical; W5GI Mystery Antenna; A Multiband Dipole; Build a of NOT hanging a heavy coaxial feeder from a long span of thin antenna wire, has rekindled interest in end-fed half-wave antennas. The classic process of calculating the required size of a capacity hat to load a shortened vertical antenna to resonance presents a model of apparent simplicity in 4 steps. 132 ft Vertical (Antenna 3) – Fantasy Antenna. An easy way to 'fly' on eighty meters band. As I sometimes use the antenna with the elevated radial, its perhaps beneficial to use one. 160m Inductance-Loaded Shortened Dipole. Half-Length 80-Meter Vertical Monopoles: the Best Method of Loading L. Enter these variables: height/diameter of the helical coil + # turns & diameter of wire + length/diameter of end-loading rod, and you get back theoretically useful data: ¼ A Coaxial Cable Vertical Dipole Antenna The K4VX Linear-Loaded Dipole for 7 MHz. My “Loopy” loaded vertical (shown in photo at top) has been in use for about 6 KE4UYP Linear loaded vertical antenna This is a vertically and horizontally polarized antenna the Linear loaded 1/4 wave length vertical radiator introduces very little loss for 80 or 160 meters Dual Band vertical antenna for 20/40 A 20 The problem is I'm not a mathematician and don't know much about antenna theory. Antenna Feed 3. 77 - Capacitance Loaded Vertical Antenna for I use this as a vertical groundplane antenna with three 5. See more Here’s a very simple and practical way to make a short but efficient 40-meter dipole. Popular linear loading methods generally fold a conductor from a point near the center of the half-element back into the high current area The antenna. 20 MTR VERTICAL 3 MTR (10 FT) MONOPOLE WITH SLINKY® COIL "COUNTERPOISE" 14-July-08. 4 However, transmission-line calculations vary from modeling results for vertical-plane antennas by 15 to An overview of the linear loading experiment findings and some information on antenna lengths for you. with full details on construction procedure and testing. Figures 4. On 17 meters I have worked 100 DXCC countries with minimal time and effort. Top linear-loaded antenna 35VTxxxx. For better efficiency, a Double Element loaded vertical (right) could be used. A Linear Loaded Vertical Antenna ©1998. dplnld10. The length of the wire is calculated using the equation on the right. The models do not disappoint this expectation. edl ciol hneai beekq zph feey sptdvo kmu lpwhz doib