A method of receiving and transmitting radio frequency signals by a vehicle, the method comprising: providing a transceiver module, the transceiver module being located onboard the vehicle, the transceiver module comprising a plurality of transceivers (40 - 56), each transceiver (40 - 56) being configured to operate within a different respective radio frequency band; receiving, by a first transceiver of the transceiver module, a first radio frequency signal having a first frequency and a first waveform, the first frequency being a frequency within a first radio frequency band, the first radio frequency band being a band within which the first transceiver is configured to operate; determining, using the first frequency and the first waveform, by a communications management module located onboard the vehicle and operatively coupled to the transceiver module, a second frequency and a second waveform, the second frequency being a frequency within a second radio frequency band, the second radio frequency band being different to the first radio frequency band, the second waveform being different to the first waveform, wherein the step of determining comprises: acquiring, by a waveform synthesiser, a waveform specification for the second waveform, wherein the waveform specification is selected from a waveform library, the waveform library being located onboard the vehicle and containing a plurality of different waveform specifications, wherein a waveform specification is selected that: is capable of being synthesised by the waveform synthesiser; specifies a waveform that is different to the first waveform to minimise receiver desensitisation; and is capable of being transmitted by a second transceiver of the transceiver module; and synthesising, using the acquired waveform specification, by the waveform synthesiser, the second radio frequency signal; and transmitting, by a second transceiver of the transceiver module, a second radio frequency signal, the second radio frequency signal having the second frequency and the second waveform; wherein the second radio frequency band is a band within which the second transceiver is configured to operate. providing a transceiver module, the transceiver module being located onboard the vehicle, the transceiver module comprising a plurality of transceivers (40 - 56), each transceiver (40 - 56) being configured to operate within a different respective radio frequency band; receiving, by a first transceiver of the transceiver module, a first radio frequency signal having a first frequency and a first waveform, the first frequency being a frequency within a first radio frequency band, the first radio frequency band being a band within which the first transceiver is configured to operate; determining, using the first frequency and the first waveform, by a communications management module located onboard the vehicle and operatively coupled to the transceiver module, a second frequency and a second waveform, the second frequency being a frequency within a second radio frequency band, the second radio frequency band being different to the first radio frequency band, the second waveform being different to the first waveform, wherein the step of determining comprises: acquiring, by a waveform synthesiser, a waveform specification for the second waveform, wherein the waveform specification is selected from a waveform library, the waveform library being located onboard the vehicle and containing a plurality of different waveform specifications, wherein a waveform specification is selected that: is capable of being synthesised by the waveform synthesiser; specifies a waveform that is different to the first waveform to minimise receiver desensitisation; and is capable of being transmitted by a second transceiver of the transceiver module; and synthesising, using the acquired waveform specification, by the waveform synthesiser, the second radio frequency signal; and transmitting, by a second transceiver of the transceiver module, a second radio frequency signal, the second radio frequency signal having the second frequency and the second waveform; wherein the second radio frequency band is a band within which the second transceiver is configured to operate. is capable of being synthesised by the waveform synthesiser; specifies a waveform that is different to the first waveform to minimise receiver desensitisation; and is capable of being transmitted by a second transceiver of the transceiver module; and synthesising, using the acquired waveform specification, by the waveform synthesiser, the second radio frequency signal; and transmitting, by a second transceiver of the transceiver module, a second radio frequency signal, the second radio frequency signal having the second frequency and the second waveform; wherein the second radio frequency band is a band within which the second transceiver is configured to operate.