I don't plan on putting one up. I do not see it as the best antenna to use.
People say they have worked a lot of stations with it, but others have said
they worked people using a gutter or bedspring as an antenna. :-)
The best 40m antenna I have built and used was a vertical magnetic loop
antenna, 58 feet long for the horizontal run, 12 feet high vertically. I
had the bottom wire 5 feet off the ground. It was a two-turn loop with a
quarter wavelength of 70 ohm cable at the feedpoint, which made the
impedance at the other end of the 70 ohm cable 50 ohms. Low radiation angle
made it an outstanding DX antenna on 40m. I ran the design on MININEC and
it predicted a gain of 5.5 dB over a dipole off the sides. Of all the 40m
antennas I've used, it was second only to a 40 meter beam.
Zack W9SZ
On Thu, May 8, 2025 at 1:38?PM Mike N2MS via groups.io <mstangelo=
[email protected]> wrote:
The impedance of an EFHW is dependent on many factors such as
surroundings, groung and wire gauge and changes at the higher harmonic
frequencies. Has anyone actually measured the antenna?
Mike N2MS
On 05/08/2025 2:19 AM EDT Mike via groups.io < mail@...
wrote:
I tested my unun by placing a 2400 ohm resistor in series with the S21
input. This loads the secondary with approximately 2450 ohms which is the
typical source resistance for an EFHW
--
Mike G8GYW
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