The best way to protect your antenna, mount and vehicle from damaged caused by accidental contact is to use a spring. These springs are made from spring steel and are chrome plated. The upper and lower inserts are made of chrome-plated machine brass and have standard 3/8"-24 threads to fit all Firestik and RoadPal antennas, mounts and accessories. The medium duty model works especially well with our 2ft "KW" & "FS" series antennas as well as the 3ft "FL" or "RP" antennas. The heavy duty model may be used with antennas up to 60". Physically, each spring is about 3.0" (76mm) tall with a diameter of 0.800" (20mm).
These springs are also available with a stainless steel body. See SS-3M/SS-3H.