This car roof top antenna system combines GPS, DAB, and FM/AM antenna applications. It features a car top roof thru hole mount, 5 meters of antenna adapter cable, and signal amplifier power supply cable. The system applies to normal aftermarket car navigation head units, DAB+ receivers, and DAB+ USB stick tuners. The FM/AM/DAB radio antenna specification includes a working voltage of DC 9V-16V, working current of ≤ 60mA, and output gain of 18dB±3dB. The GPS navigation antenna specification includes a working voltage of DC 3V-5V, working current of 10mA≤I≤30mA, and output gain of 28dB±3dB. The system comes with a 5-meter cable, SMA male/plug connector, and roof mounting with a drilling hole diameter of 10.5mm. The dimensions are 138.4mm * 65mm * 63mm, and the net weight is 505g. The packaging list includes 1 x antenna, including a mounting nut.