Abstract: A multiple band, polarization diversified antenna system that accommodates a plurality of independent and separate antenna subsystems that share a common aperture and boresight. The antenna system includes a first low-band antenna subsystem for one polarization mode in a low frequency band, a second low-band antenna subsystem for another polarization mode in the low frequency band and a high-band, dual-polarization, dual-reflector antenna subsystem for two high-frequency antenna subsystems having orthogonal polarization modes. The dual-reflector antenna subsystem includes a main reflector, a sub-reflector and a support cone. The two low-band antenna subsystems and the high-band, dual-polarization feed subsystems are all positioned behind the main reflector of the high-band dual-reflector antenna subsystem. The signals transmitted by the high-band antenna are directed towards the sub-reflector and are reflected therefrom to be directed towards the main reflector.