Sec. 17.21  Painting and lighting, when required.

    Antenna structures shall be painted and lighted when:
    (a) They exceed 60.96 meters (200 feet) in height above the ground 
or they require special aeronautical study.
    (b) The Commission may modify the above requirement for painting 
and/or lighting of antenna structures, when it is shown by the applicant 
that the absence of such marking would not impair the safety of air 
navigation, or that a lesser marking requirement would insure the safety 
thereof.
[ 32 FR 11269 , Aug. 3, 1967, as amended at  42 FR 54824 , Oct. 11, 1977]