Chevy, GMC, Cadillac Radio Antenna Works With 2007-2014 Trucks & SUVs 7mm Base Works With All GMC, Chevy, & Cadillac Trucks & SUVs From 2007-2013 Including Silverado, Escalade, Sierra, and Many More! Screws on to your existing truck antenna base, and start listening to your radio instantly! 7mm Base--30.5" long Premium Quality Product