AN/TPS-71 Relocatable Over-the-Horizon Radar (ROTHR) Receiver (site)

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A prototype ROTHR system was installed on the isolated Aleutian Island of Amchitka, Alaska, where it surveilled the eastern coast of Russia 24 hours a day, seven days a week from April 1991 to March 1993. Amchitka ROTHR U.S. Navy Base provided essential base support services for the 235-person Navy station at Amchitka Island, 1,400 miles southwest of Anchorage in the Aleutian Chain, from December 1988, until the base's closure in 1993. The system on Amchitka was dismantled at the end of the Cold War, but the first production system was installed in Chesapeake, Va., and declared operational in April 1993 in a counter-drug role in support of U.S. Atlantic Command.

The transmitter station was at the northern end of the island.

Amchitka was also the site of a US Navy direction finder station (call signs NJZ and NDN) from August 1943 until February 1945.

www.fas.org/nuke/guide/usa/airdef/an-tps-71.htm