Designed for use with our fixed installation transceiver unit (TDC-610) to enable you to add a larger antenna for better communication range. The antenna base can be mounted in a bracket and a suitable sized hole should be drilled for the PL259 plug to pass through for connection to the fixed unit. PL259 connection: 17(dia)mm RG58 Coax Cable Antenna base dimensions: 44(Dia) x 40(H) Cable length: 450mm Specifications Packaged Volume : 1.42l Packaged Weight : 0.22kg Packaged Length : 10.5cm Packaged Width : 30cm Packaged Height : 4.5cm Height : 40mm Cable length : 4.5m Diameter : 44mm For use with our external antenna base (TDE-315) or any other antenna base with suitable connecting thread. Operating Frequency: 477MHz Length 653mm Gain: 5-6dBi Impedance: 50Ohm Operating Temp: -20°C to +65°C Dimensions: 60(L) x 7(Dia)mm Specifications Packaged Volume : 0.5l Packaged Weight : 0.09kg Packaged Length : 66cm Packaged Width : 5cm Packaged Height : 1.5cm Length : 650mm Diameter : 7mm Communications Band : CB Frequency Band : 477Mhz Antenna length : 650mm Antenna Frequency range : 476.42MHz, 477.41MHz Impedance : 50Ω Polarization : Vertical Antenna Gain : 6dBi Antenna or Accessory Type : Whip Base / Mount Point Material : 1/2inch BSW