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.

[[Page 45]]

    (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]