TomTom External Antenna for GO 300 and 700 Navigators (1D00.008)(Discontinued by Manufacturer) External antenna for your TomTom GO 300 or 700 navigator Overcomes athermic heat-reflecting windshields and built-in windshield heaters that block GPS reception Magnetic GPS antenna makes it a snap to quickly place inside or outside your car Easy to install, just plug the external antenna into the docking shoe Simply dock your TomTom GO and you are ready to go