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Dear Mr. Carpenter,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the declassified file American Cryptology During the Cold War, 1945-1989; Book II: Centralization Wins, 1960-1972 from the National Security Agency that includes some information about Teufelsberg. This file has been digitized and can be viewed online via the National Archives website.
We also located the series Records of the Security Agency Field Station, Berlin, 1964-1966 in the Records of United States Army, Europe (Record Group 549), which may contain some relevant information. Plus, we located 9 series related to Berlin and 3 files related to listening stations in the Records of the National Security Agency/Central Security Service (Record Group 457) that might be of interest to you. These records have not been digitized. Please contact the National Archives at College Park - Textual Reference (RDT2) at firstname.lastname@example.org for access to and information about these and similar records.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this information is helpful. Best of luck with your research!