Giulia Veloce AWD
Join Date: Jan 2005
Location: The Netherlands
County: Zuid Holland
b-sting antenna is of no use for gps, gps uses a special active antenna (small square box) specific for gps.
However, as you stated, almost all gps systems come with their own gps antenna. These usually have a magnetic base, and you can just mount it invisibly on top of the metal case of the nav/radio beneath the dashboard. It will get sufficient signal there.