---
kind: "section"
citation: "47 C.F.R. § 87.451"
title: "47"
number: "87.451"
heading: "Licensing limitations."
url: "https://uscodex.org/cfr/47/87.451"
---

# §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.

## Notes

### Amendments

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

### Authority

Authority: 47 U.S.C. 154, 303 and 307(e), unless otherwise noted.

### Source

Source: 53 FR 28940, Aug. 1, 1988, unless otherwise noted.

### Amendments

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