Gary,
The biggest problem would be in trying to use the radio without
connecting an antenna to it. If you can be sure of always doing that,
then I would ground the unused antenna (personal preference, radio is
grounded anyway). Same thing if you ground the radio's antenna
connection. If you forget, it causes problems, sometimes big ones. I
tend to make allowances for my bad memory. You may not have that
problem, so...
- 'Doc