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Radio Listening Posts were established by the Federal Communications Commission within the United States to listen to radio traffic during World War II. One of these was at Scituate, Rhode Island. Others were at Fort Ward (Washington), Winter Harbor, Maine, Amagansett, New York, Cheltenham, Maryland and Jupiter, Florida. About one year before the United States entered WW2 Thomas B. Cave was sent to Rhode Island to set up a secret radio listening post. The purpose of the post was to detect radio transmissions from German spies in the United States and assist in locating downed aircraft. In March 1941 he abandoned his first choice of Greenville, RI for a farmhouse with 183 acres of land located on Darby Road near Chopmist Hill in Scituate, Rhode Island. The FCC leased the farmhouse from Mr. William A. Suddard.〔Providence Journal 11/22/1945〕 The completed listening post contained over 80,000 feet of wire, 11 antennas and many advanced radio receivers.〔NSA History Today Articles, 30 March, 2010〕 The site included two direction finding antennas. These could be rotated to get a bearing on the transmitting station. This information when compared with similar measurements from other distant stations allowed the transmitting location to be triangulated. The use of two of these antennas meant both parties in a conversion could be located.〔''Providence Journal'' 11/22/1945〕 ==Reception== The resulting listening site had characteristics way above what had been hoped for. A variety of signals was picked up with a regularity that cannot be explained. In Mr. Cave’s words “This site was the best location in the country for radio transmission and reception”.〔Providence Journal 11/22/1945〕 This site as well as others was a well-guarded secret until the FCC authorized a reporter to visit the site in March 1945. 〔''Providence Journal'' 11/22/1945〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chopmist Hill Listening Post」の詳細全文を読む スポンサード リンク
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