47 CFR § 87.451 - Licensing limitations.

---
identifier: "/us/cfr/t47/s87.451"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "47 CFR § 87.451 - Licensing limitations."
title_number: 47
title_name: "Telecommunication"
section_number: "87.451"
section_name: "Licensing limitations."
chapter_name: "FEDERAL COMMUNICATIONS COMMISSION"
subchapter_number: "D"
subchapter_name: "SAFETY AND SPECIAL RADIO SERVICES"
part_number: "87"
part_name: "AVIATION SERVICES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "47 U.S.C. 154, 303 and 307(e), unless otherwise noted."
regulatory_source: "53 FR 28940, Aug. 1, 1988, unless otherwise noted."
cfr_part: "87"
---


# 87.451 Licensing limitations.

Operational fixed stations are subject to the following licensing limitations:

(a) A maximum of four frequencies will be assigned.

(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.

(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.

[53 FR 28940, Aug. 1, 1988, as amended at 90 FR 57710, Dec. 12, 2025]