I have a 2007 LS Coupe, bought it new in October.

It has the "black tie" radio with the auxiliary input. Anyways, the FM reception is pretty bad. Already the dealer has taken the radio out to make sure the connectors were snug, and when that didn't help they replaced the head unit. Neither of these have improved reception any.

Any suggestions on an aftermarket antenna that might improve reception? Most of the antenna posts around here are about improving appearance

Also, How does one test the antenna or the antenna wire?

Thanks!