Antenna systems used in satellite communications are the vital link in the transfer of information between the ground station and the satellite and also between satellites. The increasing sophistication of each successive generation of satellites has meant that their antenna requirements have become more demanding. Further, with the reduction in the angular spacing between satellites in the geostationary orbit, tighter specifications are being placed on the earth station antenna. In this paper the authors review the antenna technology that has been developed to meet these demands. Current and projected antenna systems will be discussed, with reference to the INTELSAT and AUSSAT satellite systems where applicable.