| http://www.w3.org/ns/prov#value | - The three radiators are driven by a radiator driver 24, preferably in a manner described below, and the signals received by the receiving antennas are amplified and processed, together with a representation of the signals used to drive radiators 18, 20 and 22, preferably in the manner described below, in a signal processor 26 to provide a display or other indication of the position and orientation
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