| http://www.w3.org/ns/prov#value | - A direction-finding antenna system for determining the signal direction from which signals from a signal source are received, the system comprising:A. first and second concentric circular arrays, each array having N equally spaced antenna elements, where N is an even number greater than two, the first and second arrays being angularly offset by 180???/N; B. a processing circuit, connected to recei
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