Sec.  21.109   Antenna and antenna structures.

   

   (a) In the event harmful interference is caused to the operation of
   other stations, the Commission may, after notice and opportunity for
   hearing, order changes to be made in the height, orientation, gain and
   radiation pattern of the antenna system.

   (b) The Commission may require the replacement, at the licensee's
   expense, of any antenna system of a permanent fixed station operating
   at 2500 MHz or higher upon a showing that said antenna causes or is
   likely to cause interference to any other authorized or proposed
   station.

   [ 44 FR 60534 , Oct. 19, 1979, as amended at  52 FR 37783 , Oct. 9, 1987;
    61 FR 26675 , May 28, 1996]