Comet GP-9M - High Gain Dual Band Collinear Base Antenna 144-430MHz. Technical Specifications: Frequency: 144 & 433 MHz Max Power: 200 watts Gain: 144 / 8.5dBi, 433 / 11.90dBi Connector: PL259 (M) Type Impedance: 50 Ohms V.S.W.R: Less than 1.5 Available Mast: 30-62mm diameter Weight: 2.2kg Length: 5.15m