Hey guys...just thought I'd share some info with everyone....I work as a car audio installer and have done so for the past 10 years. This is a product that i've been using for a while now. Works great, it's small and can be hidden almost anywhere under the dash with great FM reception (even better than most OEM late model factory antenna's) The part is made by Metra Electronics and can be seen here:
http://www.metraonline.com/part/44-UA20

This little antenna uses the metal on your car as a reciever for the signal...pretty cool i think and descently priced. I beleive retail is rougly 40 to 60 dollars depending on where you go. Hope this helps