Sirio Gain-Master Hi-Tech Fiberglass 10m & CB Base Antenna Type 0.625 wavelength center feeded vertical dipole; Frequency Range @ SWR &lt;=2.0 25.5 - 30 MHz 400 CB channel & 10m ham band Impedance 50 Ohms; Radiation Omnidirectional; Polarization Linear Vertical Max Gain on the horizon 1 to 2 dB higher than conventional 5/8 wavelength Max Power 500 Watts (CW) continuous, 1000 Watts (CW) short time Ligthning protection All metal parts are DC-grounded, the inner conductor shows a DC-short