Leaderboard

If your asking about GMRS/UHF, then once you get the antenna cut to specification, is should make no difference if you move the magnet mount to the top of a car, truck, train, or Maytag washer, it should be about the same SWR, since the quarter wave ground-plane is only about 6 inches. If you use a mag mount, it just won't matter that much which vehicle it is on, it is a compromise, sure; but it should get the job done just fine in most cases. If you want a great mobile antenna, I would suggest a quality permanent NMO mount type antenna, but most mag-mounts will do a very respectable job... with no need to re-tune after changing cars. Basic unwritten rule of magnetic mount antennas: -- Have at least a quarter-wave of metal all around the magnetic base for the ground plane. This means: About 6 inches (in radius) on UHF. About 18-20 inches (again, radius) on MURS, VHF, 2-Meters and about 8 feet on CB antennas,which is why mag-mounts don't work well there. (hahaha.. Partial joke, partial truth)

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