Product description Compatibility: This works on the GM, UM8, factory navigation system, except for the Corvette, Seville and Deville vehicles. Compatibility: GM, GMC, CHEVY, TAHOE, YUKON, Avalanche, Suburban, Denali, Sierra, Silverado, AND MORE. GM Ref Part Number: 15135178 / 15135435 2002 - 2008 Cadillac Escalade (including EXT) 2003 - 2008 Chevrolet Avalanche 2003 - 2008 Chevrolet Suburban 2003 - 2008 Chevrolet Tahoe 2006 - 2008 GMC Sierra (including EXT) 2003 - 2008 GMC Suburban 2002 - 2008 GMC Yukon 2001 - 2004 Chevrolet Trailblazer 2003 - 2007 Hummer H2 2002 - 2009 Chevrolet Truck (Fullsize) - 1500/2500/3500 in 2WD & 4WD 2001 - 2004 Envoy 2002 - 2007 GMC Yukon XL Denali 2003 - 2007 SSR 2002 - 2009 Cadillac Escalade, ESV & EXT 2002 - 2009 Chevrolet Avalanche 2002 - 2009 Chevrolet Silverado Truck 1500/2500/3500 2002 - 2009 Chevrolet Suburban 2002 - 2009 Chevrolet Tahoe 2002 - 2009 GMC Denali 2002 - 2009 GMC Sierra Truck 1500/2500/3500 2002 - 2009 GMC Suburban 2003 - 2008 GMC Yukon 　 　 Features: Brand New 5 Meters GPS Antenna Active Gain for better signalBuilt-in Powerful Low Noise AmplifierMagnetic Base Specification: Dielectric Antenna Center Frequency 1575.42MHz±3 MHz V.S.W.R 1.5:1 Band Width ±5 MHz Impendence 50 ohm Peak Gain >3dBic Based on 7×7cm ground plane Gain Coverage >-4dBic at –90°