Soldiers engaged in field work at the Signal Corps School of Radio and Multiplex Telegraphy in New York during World War One. They are using a loop antenna for radio direction finding. This photograph was taken on March 27, 1919, by a photographer of the

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Size: 8596px × 5874px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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