You could try putting 4 ground plane elements off the SO-239
connector, I'm told they are to help with standing wave problems.
I've never used ground plane antennas, but it wouldn't take much
effort and could be worth a try. I use the MFJ 269 antenna analyzer
when building antennas and find that the unit saves lots of time.
Rollie


Yes, I have done that, and they work very well. I found three
radials sufficient, and if bent down about 45 degrees the match was
perfect. However, for the application I am planning, the antenna must be
very portable.... ground plane radials "stick out" but the coaxial
skirted antenna has a very minimal foot print.... it can be packed in a
very tight space.... just like any pipe.

Tnx.

Ed K7AAT