Typed on verso: "Above is a Direction Finding Installation at Changyi, prefabricated in the United States and sent over 'The Hump' in parts. Installations like these helped the Army Airways Communications System in China to make the airways secure against faulty navigation. (Official USAAF Photo.)"
United States. Army Air Forces, [AACS direction-finding installation], [1991-07-17-A_image_171]. Museum of Flight Digital Collections, accessed 12/12/2025, https://digitalcollections.museumofflight.org/nodes/view/1963