Vktech Antenna 900/1800MHz GSM 7-8dBi 60W SMA 3M Suction Cup For Car Truck Vehicle This antenna is suitable for cars, trucks, boats or other vehicle use. It improves cell phone voice and data reception, adding bars of signal to your phone and increased data transfer speeds. It also helps prevent dropped calls. It doesn't require a direct connection to your phone, but rather works wirelessly. It can also work for multiple users at the same time.