I had the same problem with my 70 Challenger with the new after market antenna. Took a grinder to the half moon mounting brackets underneath the fender. Took off about 1/8 of an inch. Then mounted fine.
I had the same problem with my 70 Challenger with the new after market antenna. Took a grinder to the half moon mounting brackets underneath the fender. Took off about 1/8 of an inch. Then mounted fine.