Hi John,

You didn't say, but I assume that you are feeding it against several quarter
wave radials at or near ground level. You will get a feed impedance of less
than 50 ohms, so you will need some matching to get a 1:1 swr. You need to
concentrate on getting resonance irrespective of swr and then match the
anteena feed for minimum swr. This can be done quite simply by putting a
capacitor, usually silver mica, across the coax at the feed point, or by
inserting a transformer between the coax and the antenna to match something
like 10 to 20 ohms to the 50 ohm feed. The capacitor is the easiest to try
first, and you will probably need something between 50 and 100 pf.

I hope you find this useful, and I wish you success. 73, Jack. G3PVG.

"J. Laub" wrote in message
...
I've constructed a 1/4-wave 15m vertical from 11' of 3/4" copper tubing
(water type). It's being fed with coax.

Much to my frustration, I am unable to get this thing to resonate w/o
the use of a transmatch. Any tips, ideas or good plans?

73's

-=Jon