Allen Telescope Array

The Allen Telescope Array (ATA) is a radio-telescope array of 42 6.1-meter dishes at the Hat Creek Radio Observatory (HCRO) in northern California, owned by the SETI Institute (an organization supporting SETI research, the search for extraterrestrial intelligence). It has a wide field of view and covers frequencies 0.5-11.2 GHz. In addition to SETI research, it is suitable for other radio astronomy applications including 21-cm line observations, and it has been used for and radio time-domain astronomy, including pulsar and magnetar study, as well as fast radio burst (FRB) discovery and study, the latter of both SETI and astrophysics interest. The 42 dishes (ATA-42) went operational in 2007, after which there have been some receiver upgrades.

Plans from the beginning have been to increase it in stages to 350 dishes (ATA-350), but as of 2024, I've found nothing to indicate that it has more than the original 42. Significant expansion would require a substantial grant; The SETI Institute is privately funded and it has been a challenge simply to fund the ATA's operation, and funding beyond that has been used to update the existing configuration.