The Australian Defence Satellite Communications Ground Station is located at Kojarena, 30 km east of Geraldton in Western Australia. It is operated by the ADF Defence Signals Division [DSD]. As of November 2005, the base was staffed by 79 personnel, and housed five radomes and eight satellite antennas.
The Kojarena station is a major Australian DSD signals interception facility, and is part of a worldwide system of satellite communications keyword monitoring known as Echelon operating within the wider UKUSA signals intelligence system.
In November 2007 the Australian government announced the signing of a Memorandum of Understanding with the United States government for the building of an additional but separate facility within the grounds of the ADSCGS. This is to consist of three small buildings, three 19-metre antennas, and two smaller antennas making up a joint US-Australian ground station for the US Department of Defense Mobile User Objective System, a narrow-band networked satellite constellation for Ultra-High-Frequency satellite communications enabling secure all-weather and all-terrain 3-G mobile telecommunications.