The CPO is a tough and durable 3G and GSM puck antenna with 2-3 dBi gain. The antenna is a screw-mount antenna requiring a 20mm hole. The cable exit is on the underside of the antenna and once mounted is totally enclosed, watertight and secure. The antenna is secured in place by a nut that is tightened from underneath. The CPO is ideal for metering, telemetry and telematics applications where a discrete antenna is required, but performance cannot be compromised.A cellular version (CPT) and 2.4/5.8 GHz (CPW) version of this antenna are also available.