HYS antennas are individually Tested to insure proper compatibility with your Radio and Frequencies! HYS antennas are dependable, accurate, reliable and affordable. 144/430Mhz indoor and ourdoor Low-profile whip Antenna work for SO239 Motorola Kenwood Icom Vertex Blackbox HYT Hytera Baofeng Midland etc Two-Way Radio, Uniden Base/Mobile Scanner. 3.5inch Magnetic Base ( Need the Metal Ground Plane), the magnetic base Easy to install, plug and play installation. Maximum Power Input-watts:50 W; Gain: 2.15dBi/3.5dBi. Omni-Directional, 43.5cm(17.12inches) Stainless Steel Antenna. 144MHz/430Mhz(136-174Mhz&400-470Mhz) Magnetic Base Antenna work for SO239 VHF&UHF mobile radio, Radio Scanner, Ham Radio Transceiver, Handheld & Amateur Radio Equipment.