elephant cage
n.— «The 6,000 U.S. servicemen and women stationed at Misawa Air Base spend a lot of time thinking about North Korea. Eavesdroppers in a top-secret listening post at the base likely target the Stalinist nation with their gigantic antenna, a circular fencelike structure nicknamed the elephant cage.» —“Pacific Military Security Grows More Cooperative” Oregonian (Portland, Oregon) Nov. 15, 1993. (source: Double-Tongued Dictionary)
Further reading
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