Sirio Antenna GPS 27 1/2 10m & CB Base Antenna Base station antenna, omnidirectional tunable by acting on the whip length low radiation angle Frequencies range: 26-28 MHz; impedantie: 50O unbalanced , 1/2 wave Gain: 1/2: 0 dBd, 2.15 dBi bandwidth at S.W.R. 2:1 Maximum power: 250 watts Made in Italy