The AN/FPS-108 Cobra Dane radar is a passive electronically scanned array installation operated by Raytheon for the United States Air Force at Eareckson Air Station on the island of Shemya, Alaska. This radar system was built in 1976 and brought on-line in 1977 for the primary mission of intelligence gathering in support of verification of the SALT II arms limitation treaty. Its single face radar with a 29 m (95 ft) diameter phased array radar antenna (52.7373°N 174.0914°E) faces the Kamchatka Peninsula and Kura Test Range.