TRIAX SG 18 Element A (Bagged)(Fitted with PCB Balun)Constructed from aluminium, magnesium and manganese alloy the SG range of aerials are extremely resistant to the most adverse weather conditions. The extra large rear reflector provides an excellent front to back ratio and the PCB balun (with captive signal transfer) provides excellent signal transfer.Number of Elements: 18Gain: 14.5dBFront/Back: >25dBBeamwidth: +/- 18 degreesWindload (N): 65Weight (kg): 1.62Size (mm): 1836 x 420mm