02-23-2011, 08:39 PM
Join Date: Jun 2009
My Ride: 323i, 530i, Z4 3.0i
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.
Originally Posted by Solidjake
Why is the placement bad? Where is it better
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.
E46 323i Sport/5 speed/TiAg | 231k miles
E85 Z4 3.0i Sport/6 speed/Toledo Blue | 74k miles
E39 530i M-Sport/5 speed/Topaz Blue | 196k miles
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Last edited by jneumann; 02-23-2011 at 08:40 PM.