under section 45BB(a). . (c) Clerical amendment The table of sections for subpart D of part IV of subchapter A of chapter 1 of the Internal Revenue Code of 1986 is amended by adding at the end the following new item: Sec. 45BB. Credit for certain contributions with respect to broadcast stations. . (d) Effective date The amendments made by this section shall apply to contributions made in taxable years beginning after the date of the enactment of this Act.