It very much depends on what you want to do with your CB. If your main use is going to be to talk to other vehicles in a group on a trail, then just about anything will be plenty good enough. If you want maximum range and the best possible reception, then a roof mounted antenna is probably going to be better. I happen to be a fan of Wilson antennas, been using a Wilson 1000 since 2009 and it still works great. My CB antenna sits on a magnet mount on the roof of the truck.
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