In Zoning District Nos. 1, 2 and 3, satellite earth stations shall be only installed in the rear yard of a lot, except that if credible evidence is presented to the Zoning Official that satellite signals cannot be obtained from such rear yard, then the earth station may be located in a side yard, if so determined by the Zoning Official, and further excepting that if credible evidence is presented to the Zoning Official that usable satellite signals cannot be obtained from the rear yard or either side yard of a lot, then the earth station may be located in the front yard of the lot if so determined by the Zoning Official, and further provided that if credible evidence is presented to the Zoning Official that satellite signals cannot be obtained from any yard on the lot, then the earth station may be placed on the roof or sidewall if so determined by the Zoning Official. The Zoning Official, if he or she determines that a roof or sidewall mounting is necessary, shall waive the requirements of Subsection
B of this section and shall require a mounting on the roof so as to least obstruct the view and sunlight of the owners and occupants of contiguous properties. "Credible evidence," as used in this chapter, shall mean certification or an affidavit from a qualified expert that the satellite earth station, if ground-mounted in the rear yard, then side yard and then front yard, does not have the look angle with azimuth alignment and elevation alignment needed to receive signals in a substantially unobstructed manner.