ANT50Blue | .50 Caliber Bullet Shaped 4 inch Antenna, Universal, Fits Most Models, Black with Blue tip,� Reception may not work well in Rural areas. If you listen to AM stations we don't recommend changing your Factory Antenna. This antennae will not fit 2007-18 Silverado/Sierra and other GM vehicles with a 7mm threaded base unless you use a ANT7mm adapter �