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Random Wire Antenna
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Ronald Morrison
Just because an antenna can be matched doesn't mean that it is a good radiator. For one thing, the radiation pattern gets very complex at higher freq. Height above ground has a major impact on the vertical angle of radiation, etc. Also, you have high loss in the coax due to the high SWR on it. A single counterpoise will have the same problem with a reactive impedance as the "random wire" has, so it is best to have at least one 1/4 wave radial for each band. In addition, radials are lossy on the ground. Even one foot above ground is more efficient. Ron, K5DUZ
On Sunday, June 14, 2020, 01:35:40 PM CDT, Darryl J Kelly <kk5ib01@...> wrote:
I have a 70' end fed wire, 10' at feed end up to a tree at 25', last 20' sloping down, 9:1 unun, 50' of coax on ground, 26' counterpoise sloping down to and on ground. High SWR 6.7 at 6 meters, most much lower, high impedance 110, also most much lower. Tuneable on 80 through 6 meters with LDG AT-200 Pro II tuner. I have very good SWR measurements with different random lengths from 40' to 115'. Just my experience. Darryl, KK5IB
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Darryl J Kelly
I have a 70' end fed wire, 10' at feed end up to a tree at 25', last
20' sloping down, 9:1 unun, 50' of coax on ground, 26' counterpoise sloping down to and on ground. High SWR 6.7 at 6 meters, most much lower, high impedance 110, also most much lower. Tuneable on 80 through 6 meters with LDG AT-200 Pro II tuner. I have very good SWR measurements with different random lengths from 40' to 115'. Just my experience. Darryl, KK5IB
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