§  73.816   Antennas.

   (a) Permittees and licensees may employ nondirectional antennas with
   horizontal only polarization, vertical only polarization, circular
   polarization or elliptical polarization.

   (b) Permittees and licensees may employ directional antennas in the
   LPFM service, in accordance with paragraph (d) of this section.

   (c) [Reserved]

   (d)(1) Composite antennas and antenna arrays may be used where the
   total ERP does not exceed the maximum determined in accordance with
   § 73.811(a).

   (2) Either horizontal, vertical, circular, or elliptical polarization
   may be used provided that the supplemental vertically polarized ERP
   required for circular or elliptical polarization does not exceed the
   ERP otherwise authorized. Either clockwise or counterclockwise rotation
   may be used. Separate transmitting antennas are permitted if both
   horizontal and vertical polarization is to be provided.

   (3) An application that specifies the use of a directional antenna must
   provide the information identified in § 73.316(c) except that such
   information shall not be required of:

   (i) Public safety and transportation permittees and licensees eligible
   pursuant to § 73.853(a)(2) using directional antennas in connection with
   operation of Travelers' Information Service stations;

   (ii) LPFM permittees and licensees proposing a waiver of the
   second-adjacent channel spacing requirements of § 73.807 for the sole
   purpose of justifying such a waiver; and

   (iii) LPFM permittees and licensees using directional antennas solely
   for the purpose of meeting the international border zone distance
   requirements of § 73.807(g).

   [ 65 FR 67303 , Nov. 9, 2000, as amended at  78 FR 2106 , Jan. 9, 2013;  85 FR 35573 , June 11, 2020]