A duplexing apparatus comprises a hybrid junction module having an antenna port, a transmit port, a receive port and a balance port. The apparatus also comprises a feedforward circuit arranged to be responsive in respect of a first transmit band of frequencies and a second transmit band of frequencies, the feedforward circuit having an input operably coupled to the transmit port of the hybrid junction module and an output. The hybrid junction is arranged to isolate substantially the receive port from the transmit port in respect of the first transmit band of frequencies and substantially not to isolate the receive port from the transmit port in respect of the second transmit band of frequencies. The feedforward circuit is also arranged to favour propagation therethrough of signal frequencies in the second transmit band over signal frequencies in the first transmit band, thereby rendering a compensation signal at the output.