Shortwave Enthusiasts Discussions about Radios and SWL Broadcast Stations on the air.
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Many thanks to SWLing Post contributor, Grayhat, who shares the following: I stumbled upon a document I found in the “CIA reading room”: https://www.cia.gov/library/readingroom ... 0013-1.pdf
In short, the document, titled “HF SPACED LOOP ANTENNA” and dating back to 1967, describes the design of a “direction finding” antenna used to find an HF transmitter. The document describes […]
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