Wayne wrote:
"Owen Duffy" wrote in message
...
"Wayne" wrote in
news:cbKpi.3766$7w.1151@trnddc05:

...
You might try the matching system used on the old "Gotham Vertical".
This uses a tapped coil from the base of the mast to ground. The top
of the coil is tapped down until resonance is found. Coax braid is
to ground, and the coax center conductor is tapped up from the bottom
of the coil for best match.
Whilst this system might work for an antenna with a capacitive feedpoint,
will it work for an inductive feedpoint such as this ~3/8 lambda attena?

Owen

Just add enough coil to bring it to 3/4 lambda resonance. Wouldn't that
work?

No. Adding a coil won't bring the system to resonance -- you can't
cancel inductive reactance by adding inductive reactance. The fact that
a small coil behaves somewhat like a short piece of wire has fooled some
people into thinking that a large coil acts like a long piece of wire.
It doesn't.

Roy Lewallen, W7EL