Years ago I almost put 4' fiberglass antennas on my Ranger. I wanted to put one on each side of the cab and figured it would look balanced and cool. Except when I started learning about CB setups, I discovered that one antenna would have to be just for looks because if both were powered, it would cause a lot of interference, thus reducing my range considerably. IIRC, the minimum distance between two antennas is around 8 or 9', which cannot be achieved without hanging them off to the side of even a fullsize truck. Also, I found that even with base springs, fiberglass antennas are not ment to be used where you will hit overhead obstructions - like garage doors or trees - because there is a risk of breaking them.