A wireless sensor and control system includes wireless RF transmitter units and one or more receivers that communicate using more than one narrowband radio channel to provide increased reliability in the presence of unintentional radio interference. The output of a sensor transducer or closure of a switch contact can trigger transmissions at two or more narrowband carrier frequencies that are subsequently decoded by the receiver(s). The remote sensor data can then be passed to another system for processing and/or utilized to control remote devices. In accordance with one practical embodiment, the remote sensor data indicates the ingress or egress of monitored product inventory.