"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?

Is it ground mounted? And what kind of radial are in use (if any).

Does resonate in your terms mean that you have a low swr?

Mogens