Sec.  73.158   Directional antenna monitoring points.

   (a) When a licensee of a station using a directional antenna system finds
   that a field monitoring point, as specified on the station authorization, is
   no longer accessible or is unsuitable because of nearby construction or
   other disturbances to the measured field, an application to change the
   monitoring point location, including FCC Form 302–AM, is to be promptly
   submitted to the FCC in Washington, DC.

   (1) If the monitoring point has become inaccessible or otherwise unsuitable,
   but there has been no significant construction or other change in the
   vicinity of the monitoring point which may affect field strength readings,
   the licensee shall select a new monitoring point from the points measured in
   the last full proof of performance. A recent field strength measurement at
   the new monitoring point shall also be provided.

   (2) Alternatively, if changes in the electromagnetic environment have
   affected field strength readings at the monitoring point, the licensee shall
   submit the results of a partial proof of performance, analyzed in accordance
   with  Sec. 73.154, on the affected radial.

   (3) The licensee shall submit an accurate, written description of the new
   monitoring point in relation to nearby permanent landmarks.

   (4) The licensee shall submit a photograph showing the new monitoring point
   in relation to nearby permanent landmarks that can be used in locating the
   point accurately at all times throughout the year. Do not use seasonal or
   temporary features in either the written descriptions or photographs as
   landmarks for locating field points.

   (b) When the description of the monitoring point as shown on the station
   license is no longer correct due to road or building construction or other
   changes, the licensee must prepare and file with the FCC, in Washington, DC,
   a request for a corrected station license showing the new monitoring point
   description. The request shall include the information specified in
   paragraphs (a)(3) and (a)(4) of this section, and a copy of the station's
   current license. A copy of the description is to be posted with the existing
   station license.

   [ 66 FR 20757 , Apr. 25, 2001]