47 C.F.R. § 74.1290
Political programming rules applicable to program originating FM booster stations
To the extent a program originating FM booster station originates programming different than that broadcast by its FM primary station, pursuant to the limits set forth in § 74.1201(f)(2), it shall comply with the requirements in §§ 73.1212, 73.1940, 73.1941, 73.1942, 73.1943, and 73.1944 of this chapter.