Sirio Antenna Fighter 5000 42071 Ns (No Shaft) 5000 Watts 10M & Cbtrucker Antenna - Limited Edition With Camo Looks! Type: trucker antenna frequency range: 27 ... 30mhz impedance: 50 Polarization: linear vertical swr res. freq.: 1.2 bandwidth swr 2: 2600 khz (230 channel) Max. power: 1500 watts (cw) continuous 5000 watts (cw) short time Connection: 3/8"x24 thread male height (approx.): 2.02 mm/ 6.6 ft weight (approx.): 480 gr/1.06 lb This model does not has shaft, make it more firm to connect to the base