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Old 02-23-2011, 08:49 PM   #36
Zero. Leaks.
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Join Date: May 2008
Location: NYC
Posts: 31,106
My Ride: '02 330i 6MT
Originally Posted by jneumann View Post
You want the largest, flat, unobstructed grounding plane possible, especially at 11 meter (CB, ~27Mhz) frequencies. A trunk lid does not give you a very large circular ground plane, plus you also have the roof and A/B/C pillars in the way, electromagnetically. Cellular and 2.4Ghz ISM/12cm band (WiFi) can get away with far smaller, but you still need a grounding plane of some sort to get decent performance out of an omnidirectional antenna.

With almost any omnidirectional antenna, your best bet is usually in the dead center of the roof. That, however looks really odd, especially on a BMW.

More info:

Ah, I see. Thanks!
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