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]