Dear Mr. Bussey,
Thank you for posting your request on History Hub!
We searched the World War II Operations Reports, 1940-1948 in the Records of the Adjutant General's Office, 1917-1981 (Record Group 407) and Unit Histories, 1943 - 1967 in the Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter) (Record Group 338), but were unable to locate any unit records for Harbor Defenses of Portsmouth or the 22nd Coast Artillery Regiment (Harbor Defense) which was assigned to defend Portsmouth.
The loop receiving station itself would have been operated by the U.S. Navy. We located Monthly War Diaries, 3/1942 - 8/1945 of the First Naval District in the Records of Naval Districts and Shore Establishments (Record Group 181) which has been digitized and can be viewed online through the Catalog.
We also searched for “Harbor defense” “Portsmouth” and located additional records in various record groups. To access these records, please email the reference unit listed in the Catalog description.
There may be records of the U.S. Navy’s Eastern Sea Frontiers in the Records of Naval Operating Forces (Record Group 313) which include files relating to the station. For access to these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
There may also be relevant files in the records of Navy and Army installations at the National Archives at Boston (RE-BO). Please contact RE-BO at email@example.com to access these records.
We also searched online and located The World, Portsmouth and the 22nd Coast Artillery: The War Years, 1938-1948 by Portsmouth Harbor's Military and Naval Heritage that may contain citations indicating additional sources.
We hope this is helpful. Best of luck with your research!
[Some information provided by Nate Patch, Subject Matter Expert]