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Dear Mr. Buchanan,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog for radio under various Record Groups and located the following series that may contain the WWII radio chatter you seek:
- 8 series of The Radio Intelligence Division of the Federal Communications Commission [FCC] (Record Group 173)
- 31 series of the National Archives Collection of Foreign Records Seized (Record Group 242)
- 32 series of Foreign Broadcast Intelligence Service (Record Group 262)
- 17 series of the National Security Agency/Central Security Service (Record Group 457)
For access to the records in these series, please contact the reference unit indicated in the series description.
We hope this information is helpful. Best of luck with your research!