[Mobile Radio Antenna Frequency] The antenna features VHF UHF of 144/430 MHz (136-174MHz and 400-470Mhz) with VSWR less than 1.5. [Great Specifications] The antenna features great specifications with vertical polarization and gain: 144MHz (3.0dBi), 430MHz(5.0dBi) for better TX and RX. The maximum power input is 100W along with impedance ranging 50 and omni radiation. [Premium Material] This 20inch or 51cm tall antenna is composed of stainless steel making it durable and lightweight with a weight of 160g. The NMO mobile transceiver antenna requires no tuning. [Compatibility] The two-way antenna is compatible with VHF UHF Motorola Kenwood Icom Vertex Blackbox HYT Hytera mobile radios. [What You Get] The TWAYRDIO package contains 1*dual band NMO antenna that is professionally tested and 1*small L-type installation tool. Please note that the NMO magnetic base in not included. If you run across any problems or issues, please feel free to contact us.