The OTC Satellite Earth Station Carnarvon, an Earth station in Australia, was established to meet the need for more reliable and higher quality communications for the Apollo program. NASA contracted Australia's Overseas Telecommunications Commission (OTC) "to provide an earth station near Carnarvon, Western Australia to link the NASA tracking station in that area to the control centre in the USA", also contracting COMSAT to launch three Intelsat-2 communications satellites.
The 12.8m-wide Casshorn antenna, commissioned in October 1966, has interacting parabolic and hyperbolic reflectors in a characteristic "sugar scoop" form. It claims to be the only remaining example in the world. The larger 29.8m parabolic dish antenna was commissioned in late 1969.