When I upgraded my headunit, the signal strength went down hill. Read that this is a common problem when you remove a factory unit, so will have to buy a signal booster, since new aerial that was advertised as improving signal (didnt really believe the ad though) didnt do anything at all. Though am not in a rush, as Green said who uses radio? I only really want it for when I cant be bothered changin CD or switchin me MP3 on.