Good thing this was bumped, or I might have missed it. I recently had a short antenna on my Focus, and while clearing some snow off of it this winter, it broke off. I didn't really care or think about it until recently, as I never use the radio anyway, and I actually like the look of no antenna. Still, after looking at it, I discovered that the bolt on the base is actually broken, and that I'm going to need a new base.
Thanks for this writeup.