ALMA antennas at the AOS

Five 12-meter antennas at the ALMA Array Operations Site (AOS), located at 5000 meters altitude on the Chajnantor plateau. In this aerial picture, taken on 24 March 2011, the antennas are positioned on the pads of the Atacama Compact Array (ACA). © ALMA (ESO/NAOJ/NRAO), W. Garnier (ALMA). Acknowledgment: General Dynamics C4 Systems