(C) In computing amounts under clauses (ii) through (iv) of subparagraph (B)—
(i) any fraction of a distant signal equivalent shall be computed at its fractional value;
(ii) in the case of any cable system located partly within and partly outside of the local service area of a primary transmitter, gross receipts shall be limited to those gross receipts derived from subscribers located outside of the local service area of such primary transmitter; and
(iii) if a cable system provides a secondary transmission of a primary transmitter to some but not all communities served by that cable system