My radio reception is poor in my 08 Avenger, and of course, the first line of defense is a replacement part. I bought a Mopar rubber whip (like original, on the roof mounted Sirius/AM/FM roof-mounted unit), and naturally, the old one just spins on the base and does not come loose or unscrew.

Can I try some more "aggressive" means to get the whip off, or does this mean replacing the base as well? And if so, am I lucky enough that the whole base is done from the OUTSIDE, rather than removing the headliner, etc?