External gps antenna with magnetic mount base the band width offered is 20mhz with an impedance of 50 ohms. The antenna has got a magnetic base for the ease in mounting. Also the material is weather proof. Mechanical data: Weight: 73g size: 50 x 37 x 18mm cable: Rg174, 3m connector: Sma malemounting: Magnetic basehousing: Black matte.