A radio telescope array at Hat Creek Radio Observatory, California, designed to search for extraterrestrial intelligence while simultaneously carrying out astronomical observations. The ATA is jointly owned and operated by the SETI Institute of Mountain View, California, and SRI International. It consists of 42 antennas, each of 6.1 m diameter, which observe at wavelengths from 3 cm to 60 cm simultaneously. It began operation in 2007. The ATA takes its name from the Paul G. Allen Foundation, which provided initial funding.
http://www.seti.org/ata Official telescope website.