it can change the electromagnetic energy which is from the satellite radio signal into electrical signal that can be applied by receiving electronic device . GPS,GLONASS antenna are made up of ceramic antenna and active antenna amplifier. It is packed with plastic shell, waterproof, dampproof, stand up to high and low temperatures ,the product has samll volume, high-gain ,wide working band,strong anti-jamming,there is magnet at the bottom of antenna., it is convenient for installation and using. It apply to the GPS, GLONASS products, such as GPS GLONASS navigation, GPS, GLONASS monitoring.