Yep, like Spazz said - I think some of the VWs out there have it, maybe even some Saturns. Seems like there is at least one other thread about this so a search might give you more specifics.

I have to be careful with my garage door, the bottom of which hangs down just enough to clip my antenna. Not so much a problem going in, but backing out is another story as the antenna doesn't really like bending that way.

And what's with these <bleep> that have to go around snapping our antennas?!