NOTE: To determine the maximum permissible effective radiated power.

(1) Using the method specified in $73.611 or charts or maps of suitable scale, determine the distance between the proposed land mobile base station and the protected cochannel
television station. If the exact mileage does not appear in Table B, the next lower mileage separation figure is to be used.
(2) Entering the table at the mileage figure found in paragraph (1) of this note, find opposite, a selection of powers that may be used for antenna heights ranging from 50 to 500 feet (AAT).
If the exact antenna height proposed for the land mobile base station does not appear in Table B, use the power figure beneath the next greater antenna height.
(3) If the power found to be permitted following this procedure is lower than that determined hereafter from Table C, this lower figure is the maximum power that may be employed at the
proposed land mobile base station.

In determining the average elevation of the terrain, the elevations between 2 and 10 miles from the antenna site are employed. Profile graphs shall be drawn for eight radials beginning at
the antenna site and extending 10 miles therefrom. The radials should be drawn for each 45° of azimuth starting with true north. At least one radial should be constructed in the direction of the
nearest cochannel and adjacent channel UHF television stations. The profile graph for each radial shall be plotted by contour intervals of from 100 feet and, where the data permits, at least 50
points of elevation (generally uniformly spaced) should be used for each radial. For very rugged terrain 200 to 400 feet contour intervals may be used. Where the terrain is uniform or gently
sloping, the smallest contour interval indicated on the topographic map may be used. The average elevation of the 8-mile distance between 2 and 10 miles from the antenna site should be
determined from the profile graph for each radial. This may be obtained by averaging a large number of equally spaced points, by using a planimeter, or by obtaining the median elevation (that
exceded by 50 percent of the distance) in sectors and averaging those values. In the preparation of the profile graphs the elevation or contour intervals shall be taken from U.S. Geological
Survey Topographic Quadrangle Maps, U.S. Army Corps of Engineers Maps, or Tennessee Valley Authority Maps, whichever are the latest. If such maps are not published for the area in
question, the next best topographic information should be used.