Abstract: A double helix antenna comprised of orthogonally-wound helix conductors is disclosed. The double helix antenna system includes a first helix conductor wound in a first direction about a vertical axis of the double helix antenna. A second helix conductor is wound in a second direction about the longitudinal axis. In a specific implementation, the first and second helix conductors are of different lengths, respectively corresponding to first and second frequency bands. Additionally, the first and second helix conductors are wound so as to be orthogonal at those horizontal planes within which the first and second helix conductors intersect or are otherwise minimally separated in the horizontal dimension. This orthogonal winding relationship between the helix conductors substantially reduces mutual coupling, thus enabling operation of separate helical antennas in close physical proximity. In a particular application, the double helix antenna system is incorporated within a portable communications device.