Cecil Moore wrote:
Bill Turner wrote:
There's no reason for the tower to be part of the antenna, so I would
suggest not connecting them. Some current will flow in the tower due to
close proximity induction, but don't make it worse than necessary.
Hopefully the tower is not resonant on any band to avoid additional
losses.

Unfortunately, the tower is close to resonance on 40m, my favorite
band. Even with elevated radials at 30 feet, it is 0.8 dB down
from a ground mounted vertical, according to EZNEC. Guess I'll go
back to my 2x4 support system. Darn!

To fix a problem on a single band, you could de-tune the tower with a
loop trap - a wire running alongside the tower for part of its height,
with a capacitor to bring the whole thing to parallel resonance.

It's described in the antenna books by ON4UN and G6XN (and possibly also
in the ARRL Antenna Handbook).



73 from
Ian GM3SEK


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73 from
Ian GM3SEK