{"data":{"id":"us/47-cfr-87.451","jurisdiction":"us","citation":"47 CFR 87.451","heading":"Licensing limitations.","body":"Operational fixed stations are subject to the following licensing limitations:\n(a) A maximum of four frequencies will be assigned.\n(b) Stations will not be authorized when applications indicate less than 16 km (10 miles) separation between a proposed station and a TV transmitter operating on either Channel 4 or 5, or from the post office of a community in which either channel is assigned but not in operation.\n(c) Stations located between 16 km (10 miles) and 128 km (80 miles) of a TV transmitter operating on either Channel 4 or 5, or from the post office of a community in which either channel is assigned but not in operation, are secondary to TV operations within the Grade B service contour.","path":["Title 47—Telecommunication","CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION","SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES","PART 87—AVIATION SERVICES","Subpart P—Operational Fixed Stations"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-47.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:28Z","sha256":"fd86b5ade39b270f728a37c082980def82b8373a116d52839d80fa502dd0cff9","source_id":"us-cfr","stale":true,"prev":"us/47-cfr-87.449","next":"us/47-cfr-87.471"},"notice":"GroundRules: Original legal text. Not legal advice."}