In an electromagnetic antenna a continuous conductor comprises a first length portion and a second length portion, the first and second length portions each having a first end and a second end whereby the first end of the first length portion connected to the second end of the second length portion at a first node, and the second end of the first length portion is connected to the first end of the second length portion at a second node. The continuous conductor extends in a generalized helical pattern as a single closed circuit around and over the surface of a generalized toroid, whereby the first length portion 14 thereof has a first helical pitch sense and extends around the major axis of the generalized toroid for a first plurality of turns, and the generalized helical pattern of the second length portion thereof has a second helical pitch sense and extends around the major axis of the generalized toroid for a second plurality of turns, whereby the first and second helical pitch senses are opposite one another. The first and second pluralities are preferably equal to one another, and are both equal to two. The first and second length portions of the continuous conductor are generally contrawound relative to one another, are insulated from one another and overlap one another. The first and second nodes are in proximate location to one another and collectively constitute a port. A signal feed is operatively connected to the port, and first and second signal terminals are operatively connected to the signal feed.
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