Circularly disposed antenna array

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A circularly disposed antenna array (CDAA), sometimes referred to as a circularly disposed dipole array (CDDA) or a wullenweber,^[1] is a large circular antenna array used for radio direction finding. They are used by military and government agencies to triangulate radio signals for radio navigation, intelligence gathering, search and rescue, and enforcement of broadcasting laws. Because their huge circular reflecting screens look like circular fences, some antennas have been colloquially referred to as "elephant cages". The term "wullenwever" was the World War II German cover term used to identify their secret CDAA research and development program; its name is unrelated to any person involved in the program.

Many such CDAA systems are used by many nations, such as the former Soviet Union and modern-day Russia, Germany, the United Kingdom, and the United States.