As of December 1st, 1987 new daytime-only stations are no longer being authorized by the FCC. MM Docket 87-131 reads as follows:"Numerous daytime-only AM stations on the U.S. clear and regional channels, many of which are typically small entities, will benefit from the proposed rule change by being enabled to enhance their broadcast service during nighttime hours."
- I. Reason for Action: The need to improve the capacity of daytime-only AM radio broadcast stations to provide improved service to the public during nighttime hours.
- II. Objective: To increase the opportunities for daytime-only AM stations to operate during nighttime hours, thereby enhancing the usefulness to the public of their broadcast programming; and to discontinue the authorization of new daytime-only stations in order to ensure the efficient use of remaining spectrum for new and improved nighttime service.
1350 WRWH-AM wrote them such a scathing petition to reconsider, they alone were named in the memorandum papers. The FCC tersely dismissed it. I'll point out that WRWH-AM currently operates 1000 watts daytime, 93 watts night-time. In 2007 they took advantage of the new rules and filed for night operations. It was only 20 years late. More here.