Abstract: An electromagnetic antenna for a non-planar surface includes a flexible printed circuit board having three or four conductive levels. The flexible printed circuit board is adapted to conform to the non-planar surface and includes a plurality of electrical connections between the conductive levels and a plurality of electrical traces on the conductive levels. The electrical connections and the electrical traces form a first helix having a first helical pitch sense from a first node to a second node, and also form a second helix having a second helical pitch sense, which is opposite from the first helical pitch sense, from a third node to a fourth node. The first and second helices are contrawound relative to each other. First and second signal terminals are provided and are electrically connected with at least one of the nodes.