Naval Security Group Activity, Winter Harbor was a radio station of the United States Navy that operated from 1935 to 2002.

This building, and the adjacent power station which was also designed by Atterbury, were listed on the National Register of Historic Places in 2013.

[2] On 28 February 1935, the U.S. Navy Radio and Direction Finding Station Winter Harbor was officially commissioned with Chief Radioman Max Gunn in charge of a complement of an 11 personnel crew.

In 2001, the base transitioned from an operational posture to focusing on the closure process, with the ultimate goal of transferring the Schoodic parcel to the National Park Service.

[1] After the base was closed in 2002,[3] the National Park Service (NPS) acquired the land and established the Schoodic Education and Research Center (SERC).