If the application of this section (particularly subsections 22-7.21a, and 22-7.21b, 3) would impose unreasonable limitations on, or prevent, reception of satellite delivered signals by receive-only antennas or impose costs on the users of such antennas that are excessive in light of the purchase and installation cost of the antenna and related equipment, the provisions of this section (except those not permitting any antenna of any type - e.g., in a front yard) may be waived or modified by the Administrative Officer. The Administrative Officer, when considering a request to waive or modify the provisions of this section, shall consider an inability to receive 85% of the maximum number of satellite signals normally available in the area an unreasonable restriction and shall consider a requirement for screening costs which exceed the normal retail installed cost of the antenna and related equipment to be excessive.