Antenna boosters were cut and designed as ground plane radials for 900MHz phones. They are mostly worthless in the iDEN 800Mhz spectrum. They are still junk for 900MHz phones anyway as a true ground plane makes contact with the base of the antenna. If you truly want to boost reception, remove the rubber ring at the bottom of the antenna inside the phone... that (according to some posts on Howard) that have since elapsed, should give you a good +3db boost.