The Wilson 4 foot Silver Load FGT Series fiberglass whip in black features Wilson Antennas tunable tip that allows for fine-tuning SWR and resonant frequency. The .375-inch diameter fiberglass rod construction has a standard .375-inch x 24 chromed brass ferrule and fully linear top-loaded maximum transfer of power. Its fiberglass construction ensures that it can withstand the elements and remain functional for many years to come. It has a unique ground lead to help ensure reduced static ignition interference and a static reducing weather cap. It is weather-band ready and has a black PVC protective weather covering. Our FGT silver load fiberglass antennas feature 18 gauge silver plated copper wire that provides superior power transmission. Universal fit with any CB radio and compatible with AM SSB or FM frequencies.