The FireStik II FS Series Antennas feature upper coil extension to increase the power handling capability of the antenna. The "FS" antennas are 100 percent American made with 100 percent American materials. To maintain a balance between flexibility and ruggedness we use a custom blended glass fiber reinforced shaft. Each is wound with heavy insulated copper wire to prevent the oxidation and shorted windings often found on non-FireStik antennas. The tunable tip mechanism is made from rust-proof brass and has a rubber O-ring to hold the adjuster in place after tuning. Our 3/8"-24 threaded base has a tapered contact point that works especially well with FireStik mounts and accessories. The tapered "lug-nut" effect transfers stress away from the threads and reduces the possibility of vibration induced loosening of the antenna in its mount. Each antenna is covered with a static reducing water-tight sleeve containing UV and pigment stabilizers.