US lawFederal (United States)RegulationsTitle 47 CFR — TelecommunicationChapter I — FEDERAL COMMUNICATIONS COMMISSIONPart 73 — RADIO BROADCAST SERVICESSubpart H — Rules Applicable to All Broadcast Stations73.170047 C.F.R. § 73.1700Broadcast day.Last amended: 2016Year: 2026Length: 22 wordsOfficial source Cite as 47 C.F.R. § 73.1700 (2026)The term broadcast day means that period of time between the station's sign-on and its sign-off. [43 FR 45849, Oct. 4, 1978]Previous47 C.F.R. § 73.1680Next47 C.F.R. § 73.1705