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Noise through the antenna can be a real pain... especially on alot of the new car/trucks/vehicle... we have had a bunch of problems from  rfi  in everything from new trucks to vans to small handicap acess buses. Usually if the rfi is really bad there is no choice but to track the problem down. 

If this is a cb, and you don't use squelch and just want to lower the noise...... dsp's are good.


If you want to take the time to track down where the noise is coming from, you will have a better idea of how to remidy the problem.


Rat Shack sold a smaller DSP that some guys in this area use with good results......its not too expensive either.