"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
How long are your radials, and where are the? If you used four 11 foot
radials, and drooped them down about 45 degrees, the antenna should look
like 50 Ohms somewhere around 21.2 MHz. Is the SWR better at the high or low
end of the band, i.e. 21.0 or 21.4 ? Coax is 50 Ohms, right. You might want
to look in some charts to see how much effect the fat 3/4 conductor is going
to make, as opposed to wire.

Tam/WB2TT