A band and polarization-selectable transceiver (30; 90), comprising: RF equipment including upper and lower band transmitters (36, 38; 98, 92) and upper and lower band receivers (40, 42; 94, 96) configured to transmit and receive in upper and lower bands separated by a stop band; a first frequency duplexer having first and second ports coupled (50, 54) to the lower band transmitter and one of the upper band transmitter or the upper band receiver, respectively, and a third port; a second frequency duplexer having first and second ports (60, 62) coupled to the lower band receiver and the other one of the upper band transmitter and the upper band receiver, and a third port; a polarization duplexer having first and second ports (70, 72) coupled to the third ports of said first and second frequency duplexers, respectively, and a third port that supports first and second orthogonal polarizations, said polarization duplexer configured to combine or to separate the first and second orthogonal polarizations; a reflective antenna comprising a feed coupled to the third port of the polarization duplexer and a main reflector; a rotatable quarter-wave plate polarizer on either side of the feed; a drive mechanism configured to rotate the quarter-wave plate between approximately +45° and -45° positions relative to the first and second orthogonal polarizations, wherein in said +45° position the polarizer converts said first and second orthogonal polarizations to third and fourth orthogonal polarizations, respectively, wherein in said -45° position the polarizer maps said first and second orthogonal polarizations to the fourth and the third orthogonal polarizations, respectively; and a controller configured to issue control signals to the drive mechanism to rotate the polarizer to one of the approximately +45° and -45° positions to select one of the upper or lower bands as a transmission band with a selected third or fourth polarization and the other one of the upper and lower bands as a reception band with a selected third or fourth polarization. RF equipment including upper and lower band transmitters (36, 38; 98, 92) and upper and lower band receivers (40, 42; 94, 96) configured to transmit and receive in upper and lower bands separated by a stop band; a first frequency duplexer having first and second ports coupled (50, 54) to the lower band transmitter and one of the upper band transmitter or the upper band receiver, respectively, and a third port; a second frequency duplexer having first and second ports (60, 62) coupled to the lower band receiver and the other one of the upper band transmitter and the upper band receiver, and a third port; a polarization duplexer having first and second ports (70, 72) coupled to the third ports of said first and second frequency duplexers, respectively, and a third port that supports first and second orthogonal polarizations, said polarization duplexer configured to combine or to separate the first and second orthogonal polarizations; a reflective antenna comprising a feed coupled to the third port of the polarization duplexer and a main reflector; a rotatable quarter-wave plate polarizer on either side of the feed; a drive mechanism configured to rotate the quarter-wave plate between approximately +45° and -45° positions relative to the first and second orthogonal polarizations, wherein in said +45° position the polarizer converts said first and second orthogonal polarizations to third and fourth orthogonal polarizations, respectively, wherein in said -45° position the polarizer maps said first and second orthogonal polarizations to the fourth and the third orthogonal polarizations, respectively; and a controller configured to issue control signals to the drive mechanism to rotate the polarizer to one of the approximately +45° and -45° positions to select one of the upper or lower bands as a transmission band with a selected third or fourth polarization and the other one of the upper and lower bands as a reception band with a selected third or fourth polarization.