[Tigers] Hidden Antennas-Not Tiger or Jensen Specific

[deiland1 at elp.rr.com]

Has anyone ever used a hidden antenna in a car? I'm considering using one in my project car and was hoping someone on one of my car lists might have some experience with them. I found this site on-line but know nothing about them:

http://www.tunetrapper.com/index.html

Just wondering if anyone knows the difference between a good one and a bad one? How do you pick out a good antenna? Any information would be appreciated.

TIA,
Dan Eiland