Interesting that you only wire up one antenna. I have never taken the time to substantiate this but, somewhere along the way in a technical conversation, it was mentioned that dual CB antenna's squishes the radiation pattern so that is more elongated forward and aft. Is this correct?While the tractors come pre-wired for CB, and have dual antennas mounted to the outside mirrors, only one is wired to where the radio is mounted in the headliner.
I've always viewed dual CB antennas as overkill personally and have an internal over-the-top roll of the eyes when I see strange mounting choices.