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==History==
===Origin in World War II Germany===
CDAA technology was developed by the German navy communication research command, Nachrichtenmittelversuchskommando (NVK) and [[Telefunken]], working on the ''Wullenweber'' during the early years of [[World War II]]. The inventor was NVK group leader Dr. Hans Rindfleisch, who worked after the war as a Technical Director for the northern Germany official broadcast ([[Norddeutscher Rundfunk|Norddeutscher Rundfunk (NDR)]]). Technical team leaders were Dr. Joachim Pietzner, Dr. Hans Schellhoss, and Dr. Maximilian Wächtler. The last was a founder of [[Plath GmbH]] in 1954 and later a consultant to both Plath and Telefunken.
The first ''Wullenwever'' was built during the war at Skibsby, north-east of the city of [[Hjørring]] (in German: Hjörring), Denmark ({{coord|57|28|39|N|10|20|04|E}}). It used 40 vertical radiator elements, placed on the arc of a circle with a diameter of {{convert|120|m}}. In an inner circle, 40 reflecting elements were placed behind the radiator elements, suspended from a structure of circular wooden support poles with a diameter of 112.5 meters. To more easily obtain true geographic bearings, the north and south elements were placed exactly on the north–south meridian.
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