On Fri, 05 Nov 2004 19:09:51 GMT, "Jimmie"
wrote in :

snip
.... Assuming the
antenna is at resonance you will see a pure resistance at the radio for only
2 lengths, an odd 1/4wl(16ft) and an even 1/4wl. At all other length unless
the SWR is a perfect 1:1 match the impedances seen at the radio end will be
complex.


The input impedance to the antenna (and coax) is complex regardless of
resonance simply because the feedpoint is slightly out of phase with
ground (the antenna wouldn't work if it wasn't). Even if the antenna
-was- purely resistive at resonance the impedance would be on the
order of 36.5 ohms (ideal), which does -not- present a 1:1 match to a
50 ohm coax. If you are getting 1:1 SWR then either the antenna has
some sort of matching mechanism or it's a dummy load.

But you are right, using 18 feet is a quick-&-dirty fix for a poor
installation.






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