The Fiberglass CB Antenna has a power rating of 1000 Watts which helps in the stable performance of the antenna. The cb antenna with mount is factory tuned at 26 – 29.5MHz. The antenna comes with an exclusive “VibraSorb” design which makes it difficult to break and increases the life of the product. Along with the aluminum mounts and heavy duty springs, it’s a highly durable product. The 1000 Watt antenna comes with a single groove mirror mount. The mount is made up of aluminum with SO-239 fitting. The mount for the fiberglass cb antenna is 3-way with single groove. The mirror mount included with the cb antenna is compatible with cables having PL-259 connectors. The aluminum mount works on all the antennas with standard 3/8 – 24 thread. This durable fiberglass cb antenna comes with heavy duty stainless steel springs. The upper and lower inserts are of chrome plated machine brass. The spring is made from top grade electro polished stainless steel and support the antenna up to 5 foot. Prostick 4 Foot Fiberglass CB Antenna with Single Groove Mirror Mount & Stainless Steel Spring - 1000 Watt Durable Radio Antenna, Studs, Heavy Duty Springs