Sec. 21.117  Transmitter location.

    (a) The applicant shall determine, prior to filing an application 
for a radio station authorization, that the

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antenna site specified therein is adequate to render the service 
proposed. In cases of questionable antenna locations, it is desirable to 
conduct propagation tests to indicate the field intensity which may be 
expected in the principal areas or at the fixed points of communication 
to be served, particularly where severe shadow problems may be expected. 
In considering applications proposing the use of such locations, the 
Commission may require site survey tests to be made pursuant to a 
developmental authorization in the particular service concerned. In such 
cases, propagation tests should be conducted in accordance with 
recognized engineering methods and should be made with a transmitting 
antenna simulating, as near as possible, the proposed antenna 
installation. Full data obtained from such surveys and its analysis, 
including a description of the methods used and the name, address and 
qualifications of the engineer making the survey, must be supplied to 
the Commission.
    (b) The owner of the antenna structure should locate and construct 
such structure as to avoid making them hazardous to air navigation. (See 
part 17 of this chapter for provisions relating to antenna structures.) 
Such installation shall be maintained in good structural condition 
together with any required painting or lighting.
[ 44 FR 60534 , Oct. 19, 1979, as amended at  61 FR 4365 , Feb. 6, 1996]