Base Station Antenna (18"), Ham Radio 144/430MHz, Omni Radiation, 3dBi Gain with N Female Connector Includes basic installation kit: Cylinder base for antenna Two (2) U-bolts, brackets and hardware to connect the antenna base to a 30mm-45mm mast Please not this product does not include dedicated wall mount brackets. Engineered for multi-band amateur radio applications, this compact 18" omnidirectional base station antenna provides robust vertical polarization across the 144 MHz and 430 MHz VHF/UHF bands. Delivering a stable 3dBi gain with a full 360-degree radiation pattern, it is optimized for repeaters, emergency communication centers, and home radio stations. Built for long-term outdoor mast mounting, it features an integrated low-loss N Female connector to safeguard signal integrity in all weather conditions. Specification Value Antenna Type Base Station Frequency Range 144/430MHz Radiation Pattern Omni Gain 3dBi Connector Type N Female Polarization Vertical Mounting Style Mast Mount Length 18"