AntennaX 50 Cal Silver Bullet (5.5-inch) Ammo Antenna for GMC Sierra 3500 fits 1985 thru 2019 GMC Sierra 3500 Replace your factory antenna with this stylish yet functional LOW PROFILE (5.5 inch) Silver 50 Caliber Ammo Antenna. Made out of T-6061 Billet Aluminum with a hard Silver anodized finish that will not chip, scratch or fade over time. Installation is very simple. This is a PLUG-N-PLAY antenna, which means it screws onto your existing antenna mount (a direct bolt-on part, no wiring involved) and takes a minute to do. How is the Reception--4 out of 5 reception with most people noticing no difference at all. Makes a great gift idea for past and present Military, Policeman, and Outdoorsman.