Rear view of the amplifier housing; note the access holes for RF and power cables. The row of four holes allows airflow across the amplifier cooling fins (the fan draws air in through these holes and blows outward).
Also note the two coax stubs on the amplifier input & output connectors; these simplify connection of the coax lines from the transceiver & EME antenna. Since the amplifier input & output connectors are UHF and not waterproof while the Type N connectors on the outer ends are waterproof if properly installed, this arrangement ensures dry RF connections despite being quick to connect/disconnect.