Unless you concerned about using your CB at absolute max range, you could use a "through the glass" antenna (Radio Shack). I have them mounted in the rear window (one on each side) and I've used them for my CB and for my dual band ham radio, and they work fine. They only stick up a about 18-24" inches. I only use the CB when caravaning and have never lost contact with others in my party, unless they get several miles ahead or behind. If you looking for maximum performance, the firestik is a good antenna.