Sec.  73.6025   Antenna system and station location.

   (a) Applications for modified Class A TV facilities proposing the use of
   directional antenna systems must be accompanied by the following:

   (1) Complete description of the proposed antenna system, including the
   manufacturer and model number of the proposed directional antenna. In the
   case of a composite antenna composed of two or more individual antennas, the
   antenna should be described as a “composite” antenna. A full description of
   the design of the antenna should also be submitted.

   (2) Relative field horizontal plane pattern (horizontal polarization only)
   of the proposed directional antenna. A value of 1.0 should be used for the
   maximum radiation. The plot of the pattern should be oriented so that 0
   degrees (True North) corresponds to the maximum radiation of the directional
   antenna or, alternatively in the case of a symmetrical pattern, the line of
   symmetry. Where mechanical beam tilt is intended, the amount of tilt in
   degrees of the antenna vertical axis and the orientation of the downward
   tilt with respect to true North must be specified, and the horizontal plane
   pattern must reflect the use of mechanical beam tilt.

   (3) A tabulation of the relative field pattern required in paragraph (a)(2),
   of this section. The tabulation should use the same zero degree reference as
   the  plotted  pattern,  and be tabulated at least every 10 degrees. In
   addition,  tabulated  values  of  all  maxima  and  minima, with their
   corresponding azimuths, should be submitted.

   (4) Horizontal and vertical plane radiation patterns showing the effective
   radiated  power, in dBk, for each direction. Sufficient vertical plane
   patterns must be included to indicate clearly the radiation characteristics
   of the antenna above and below the horizontal plane. In cases where the
   angles  at which the maximum vertical radiation varies with azimuth, a
   separate vertical radiation pattern must be provided for each pertinent
   radial direction.

   (5) The horizontal and vertical plane patterns that are required are the
   patterns for the complete directional antenna system. In the case of a
   composite antenna composed of two or more individual antennas, this means
   that the patterns for the composite antenna, not the patterns for each of
   the individual antennas, must be submitted.

   (b) Applications for modified Class A TV facilities proposing to locate
   antennas within 61.0 meters (200 feet) of other Class A TV or TV broadcast
   antennas  operating on a channel within 20 percent in frequency of the
   proposed channel, or proposing the use of antennas on Channels 5 or 6 within
   61.0 meters (200 feet) of FM broadcast antennas, must include a showing as
   to the expected effect, if any, of such proximate operation.

   (c) Where a Class A TV licensee or permittee proposes to mount an antenna on
   an AM antenna tower, or locate within 3.2 km of an AM directional station,
   the TV licensee or permittee must comply with Sec. 73.1692.

   (d)  Class  A  TV stations are subject to the provisions in  Sec. 73.685(d)
   regarding blanketing interference.