Garmin makes a external antenna for all of the StreetPiliots 2620, Garmin Streetpilot 2610 and Garmin Streetpilot III that can be used to boost the signal with the GPS from outer space. Especially in mountain areas or any place where the GPS signal can be disturbed. It comes low profile and looks good on any car truck, camper, SUV or Van. It comes with everything you need to mount on your car or truck.