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I have an alta 4", no problems really. Seems to have cut down reception a little bit but not very much, sort of hard to test. I think the 2" looks bad, I imagine more antenna is good?
I had the 4" Alta but switched back to the OEM R.C. antenna since reception was poor in the city. Still get occasional static. Maybe I should get a cb length antenna?
We switched the remote control car antenna for the 2" Out Motoring stubby. It looks quite nice and, with the bump, looks just about right, I think. I dig that it's subtle. The station that I want in El Paso about 60 miles away comes in fine on both.
In general the longer the shortie the better the reception, but if you're in an urban area w/ strong signals it shouldn't matter. Plus you can always stash the OEM antenna in the boot for a quick change if you get stuck somewhere with weak signals.