Verizon Samsung Network Extender uses an internal GPS antenna for timing updates and to provideE911 services with an accurate location. It needs to be located near a window to receive GPSsignal. If this is not possible, an external GPS antenna is necessary.Gilsson high performance external GPS antenna is known to deliver high quality gps signal to airplane, boat and automobile navigation systems. It is fully compatible with Samsung Verizon 3G Network Extender. With 25ft antenna cable, Gilsson antenna provides freedom to move and relocate the Network Extender as desired.