Mine is also connected to the passenger side roof antenna, and the reception is also terrible.
The antenna always rotates "down" to the rear when traveling. I've tried adjusting it upright, but I'm afraid I'll break it by overtightening. The driver's side, CB antenna lead also didn't work. Turns out the coax had been damaged before I took delivery. I've wondered if that is the case with the am/fm radio as well.
I'm not sure how to check it. Replacing the coax is a bear. Let us know if you (or anyone) has a solution.
|