A wireless communications system for an automotive vehicle includes a vehicle control unit and a fob. The vehicle control unit includes a vehicle transceiver. The fob includes a fob transceiver and a fob control unit and is configured to transmit and receive communications through at least two channels. The fob control unit is programmed to transmit a preamble through the first of the at least two channels, transmit a preamble through the second of the at least two channels during a null space following the preamble transmitted through the first channel, transmit a data packet payload through the first channel when a null space following the preamble in the second channel is detected, and transmit a data packet payload through the second channel when a null space following the preamble in the second channel is detected. Communications are interleaved between the first and second channels.