Sirio Sy27-4 4 Elements Tunable 26.5-30mhz Yagi Antenna Base station antennas Directional, High-gain Horizontal polarization Factory tuned at mid-band High power handling capability Elements equipped whit waterproof jointing sleeve Made of aluminium alloy 6063 T-832 Type: SY 27-4: 4 element Yagi antenna Frequency range: SY 27-4: 26.9-27.5 MHz @ SWR &lt;=2, Impedance: 50 Ohms Radiation (H-plane): directional Polarization: linear horizontal Gain: SY 27-4: 11 dBd, 13.15 dBi Bandwidth @ SWR &lt;= 2: SY 27-4: &gt;= 600 KHz SWR @ res. freq.: &lt;= 1.2 Max. power: 1000 Watts (CW) continuous 3000 Watts (CW) short time Feed system / position: Gamma match / center Connector: UHF-female Materials: Aluminium, Steel, Nylon Wind load: SY 27-4: 80 N at 150 Km/h Wind resistance: 120 Km/h Wind surface: 0.07 m Dimensions (approx.): SY 27-4: 5725x4030x100 mm Boom length / diameter: SY 27-4: 4030 mm / 33 mm Max. element length (approx.): SY 27-3: 5740 mm SY 27-4: 5725 mm Turning radius (approx.): SY 27-4: 3600 mm Weight (approx.): SY 27-4: 6100 gr Mounting mast:  35-50 mm