I bought a shorty antenna (well 2), and the shorter of the 2 will become my backup when my other gets stolen. Ebayed the 2.5" one, and bought the other at the parts store. The price for both was around $20 total.
I found my thread locker the other day so maybe I'll put a bit of that on there to make stealing it a bit tougher.
It's a cool Idea though. You'd have to "delete" the hole left from removing the original. My brother was in the auto industry in Vegas, and has a number of friends in the industry that do custom work. I've thought about deleting my door handles if they could do it cheaply enough. Their work speaks for itself as it can be seen on many movie/TV autos.
This Sky's not perfect, but it's perfect...for me