Located 6.0 miles (9.7 km) northeast of Moscow, Maine, it went operational in 1990 but was closed in 1997 and placed in "warm storage" with minimal maintenance.

The system was based on a frequency modulation/continuous wave (FM/CW) radar capable of detecting and tracking objects at over-the-horizon ranges.

Successful testing resulted in the decision to develop operational OTH-B systems for the east and west coasts and in Alaska.

The fall of the Soviet Union and end of the Cold War saw the OTH-B systems rendered obsolete for detecting intruding military aircraft, however, the east coast OTH-B continued operations until 1997 and its data saw use by the United States Border Patrol for tracking aircraft used by drug smugglers, as well as the National Oceanic and Atmospheric Administration which made use of the measurements of ocean currents and weather patterns.

[2][3] By October 2011, the arrays had been dismantled and removed from the deactivated station, but microwave towers and various buildings remained.