yeah i run a 102 and a 6'' spring on mine and its great but im considering going to a 4' because of drive throughs lol

 

yeah i thought about that too. but whenever i know i'm going through one or i'm sitting in a big line in, i'll just take the 10 seconds to bend it in the roof rack or a door handle.

 

Yes dual antennas need to be spaced 102" (one 1/4 wave of the signal) apart or they will not work as well as a single antenna. Also you CB system (radio, coax cable, antenna) should be "tuned" with an "SWR Meter" (Standing Wave Ratio) this is very important, because if this out of adjustment it GREATLY affects how far you output signal can reach (how far you can talk) and can damage your radio! if you have any more questions feel free to PM me. Keep the wheel side down!

Check this link: http://electronics.howstuffworks.com/question490.htm