Product description Compatibility: This GPS antenna Compatible with the following GPS units: Alpine INE-W928R INE-W940 INE-W957HD INE-W960 INE-W960A INE-W967HD INE-W987D INE-W997D INE-W990BT Features: Brand New 3 Meters GPS Antenna GT5 Connector Active Gain for better signal Built-in Powerful Low Noise Amplifier Magnetic Base Compatible with almost all GPS with GT5 plug Specification: Dielectric Antenna Center Frequency 1575.42MHz3 MHz V.S.W.R 1.5:1 Band Width 5 MHz Impendence 50 ohm Peak Gain >3dBic Based on 77cm ground plane Gain Coverage >-4dBic at 90