That depends on a bunch of factors you didn't mention. A 1/4 wave CB
antenna is about 11 feet long IIRC. More important, it needs a ground plane
with the same radius. Most perforce shorten the antenna using coils, at the
expense of efficiency and pattern shape, and get by without an optimum
ground plane but both transmission and reception suffer - how much depends
on the vehicle, the antenna(s) and where you mount it/them. A pair of
antenna may yield a pattern favoring the road ahead and behind depending on
seperation. That's why big rigs use them. I had a cross-bed tool box with
one 6' "Firestick" mounted in it's center that worked as well or better than
anthing else I tried.

Of course 2 meters is the better solution.


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will two cb antennas make a big difference