A GPS receiver calculates its position by carefully timing the signals sent by the GPS satellites high above the Earth, and the GPS signal is actually a very weak RF signal. When a GPS is placed near a GSM antenna, its signal will be seriously interfered. All ARKNAV's GPS and GSM combination antennas have our special 10W RF protection design to prevent interference, providing you with the best reception for both GPS and GSM signals. Click the products to find more features of . | 
