§  101.517   Antennas.

   (a) Transmitting antennas may be omnidirectional or directional,
   consistent with coverage and interference requirements.

   (b) The use of horizontal or vertical plane wave polarization, or right
   hand or left hand rotating elliptical polarization must be used to
   minimize harmful interference between stations.

   (c) Directive antennas must be used at all DEMS User Stations and may
   be elevated no higher than necessary to assure adequate service.
   Antenna structures requiring FAA notification under part 17 of this
   chapter must be registered with the Commission. The structure owner is
   responsible for registering, painting, and lighting the structure if
   applicable. Requests for such authorization must show the inclusive
   dates of the proposed operation.