Sec. 21.110  Antenna polarization.

    Stations operating in the radio services included in this part are 
not limited as to the type of polarization of the radiated signal, 
provided, however, that in the event interference in excess of 
permissible levels is caused to the operation of other stations the 
Commission may, after notice and opportunity for hearing, order the 
licensee to change the polarization of the radiated signal. No change in 
polarization shall be made without prior authorization from the 
Commission.
[ 52 FR 37783 , Oct. 9, 1987]