Abstract: An electromagnetic transmitting or receiving communications system with multiple polarization capability. In the transmit mode an input signal is divided between two signal processing channels which feed a dual mode radiation element for exciting orthogonal polarizations. The signals in the two channels are shifted in phase relative to one another prior to power amplification. In the receive mode first and second channels connected to the dual mode element process received signals of certain polarizations governed by phase shifting the channel signals relative to one another, the phase shifting taking place after amplification. Various parallel channels may be incorporated in the receive mode of operation to simultaneous process signals of the same, or other polarizations and when incorporated within an array having electronic beam steering, the polarization selection may at each respective channel be combined with the beam steering function.