Sirio Antenna Siriosy 50-3 50-54Mhz 6 Meter Tunable 3 Elements Yagi Antenna 6m VHF Base station antenna directional, high-gain horizontal polarization made of aluminum alloy 6063 T-832 Type: 0.34 , 5 elements Yagi antenna frequency range: tunable from 50 to 54 MHz Impedance: 50 Gain: 8,4 dBd, 10,5 dBi Front to back ratio: 20 dB typical Max. Power (CW) 600 watts Connector: UHF-female Materials: aluminum, zamak, zinc plated steel dimensions (approx.): 3000x2060x100 mm / 9.86.80.3 ft. Weight (approx.): 4000 gr / 8.8 lb. mounting mast:  35-50 mm /  1.4-1.9 in