[TowerTalk] Field Strength Comparison TowerTalk Digest, Vol 225, Issue 8

[Don R]

This may be useful as a rule of thumb distance.

§73.186   Establishment of effective field at one kilometer. (47 C.F.R. 
§ 73.186(a)(1))

(a) Section 73.189 provides that certain minimum field strengths are 
acceptable in lieu of the required minimum physical heights of the 
antennas proper. Also, in other situations, it may be necessary to 
determine the effective field. The following requirements shall govern 
the taking and submission of data on the field strength produced:

(1) Beginning as near to the antenna as possible without including the 
induction field and to provide for the fact that a broadcast antenna is 
not a point source of radiation (not less than one wave length or 5 
times the vertical height in the case of a single element,i.e., 
nondirectional antenna or 10 times the spacing between the elements of a 
directional antenna), measurements shall be made on six or more radials, 
at intervals of approximately 0.2 kilometer up to 3 kilometers from the 
antenna ...

73,

Don


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