Patent ID: 6940471

Claim:
A helical antenna comprising at least one conductive helix having a central longitudinal axis wherein said helix is rotatable about the longitudinal axis at one end and not rotatable about the longitudinal axis at the opposite end and wherein an end of the at least one conductive helix is also adjustable along the longitudinal axis; a plurality of non-conductive positioning elements spaced along and located coaxial with said central longitudinal axis each positioning element adapted to support each of the at least one conductive helix such that the conductive helix can move through the support element and each support element also adapted to maintain an even angular spacing between two or more conductive helix about the longitudinal axis and each support element being rotatable about the longitudinal axis; and a movement element connected to the rotatable and longitudinally adjustable end of each of said at least one conductive helix arranged to change the pitch of said at least one conductive helix by rotating the rotatable end while maintaining or adjusting the diameter of each of said at least one conductive helix by also adjusting the length adjustable end of each of the at least one conductive helix along the longitudinal axis.