If this
-is the case, there is no such thing as too big a groundplane.

Is that a fact? Hm. A quarter wave groundplane is about 4' square (24" in any
direction from the base). Is an 8' square groundplane better? No, as a matter
of fact, an 8' groundplane (half-wave) for the aircraft band will be no ground
plane at all. Same for a full wave. You gotta understand what a "ground plane"
really is.


I would
-recommend getting a 1/4 wavelength VHF antenna used for either amateur
-radio (144 MHz band) or a commercial highband antenna (150-174 MHz).
-You can get ones that require a 3/4" hole in the roof or go with a
-magnet mount type.

Why spend all that money? Why not drill a hole (or make a small metal bracket,
if you don't want to drill holes in a new car) for a BNC (F) UG-1094 connector
and cut a piece of brass brazing rod 22" long. Mount the brazing rod in a BNC
(M) UG-88 connector, fill the connector body with epoxy, and bingo, a ground
plane vertical whip. Bend it back at a 30° angle and it will match 50 ohms a
little better.

Jim
Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com