The Receive Systems Module (RSM) is an option for the Antenna System Monitor (ASM) that allows the monitoring of two network receive signal paths – i.e. a dual diversity, dual Rx antennas, or hot/standby Rx antenna system, and an isolated (third) external off-air Rx path may also be monitored for additional ASM network monitoring functionality. A peak overload RF level detector is also provided for all three signal paths.