A gain plate is made of reinforced plastic for attaching to a pole and a cross arm and includes a pole channel and a cross arm channel. The pole channel has a front plate, two side plates, and two end plates that that form a rear-facing cavity. There are a plurality of cross members disposed in the rear-facing cavity and at least some of the plurality of cross members having radiused surface. The cross arm channel is disposed perpendicularly to the pole channel, the cross arm channel configured to received therein a cross arm.