---
kind: "section"
citation: "47 C.F.R. § 74.536"
title: "47"
number: "74.536"
heading: "Directional antenna required."
url: "https://uscodex.org/cfr/47/74.536"
---

# §74.536. Directional antenna required.

- (a) Aural broadcast STL and ICR stations are required to use a directional antenna with the minimum beamwidth necessary, consistent with good engineering practice, to establish the link.
- (b) An aural broadcast STL or intercity relay station operating in the 17.7-19.7 GHz band shall employ an antenna that meets the performance standards for Category A, except that in areas not subject to frequency congestion, antennas meeting standards for Category B may be employed. However, the Commission may require the replacement, at the licensee's expense, of any antenna or periscope antenna system of a permanent fixed station that does not meet performance Standard A, which is specified in the table in [paragraph (c)](#c) of this section, upon a showing that said antenna causes or is likely to cause interference to (or receive interference from) any other authorized or proposed station; provided that an antenna meeting performance Standard A is unlikely to involve such interference.
- (c) Licensees shall comply with the antenna standards table shown in this paragraph in the following manner:
  - (1) With either the maximum beamwidth to 3 dB points requirement or with the minimum antenna gain requirement; and
  - (2) **With the minimum radiation suppression to angle requirement.**

## Notes

### Amendments

[48 FR 50333, Nov. 1, 1983, as amended at 49 FR 7130, Feb. 27, 1984; 50 FR 48599, Nov. 26, 1985; 51 FR 19840, June 3, 1986; 62 FR 4922, Feb. 3, 1997; 68 FR 12767, Mar. 17, 2003]

### Authority

Authority: 47 U.S.C. 154, 302a, 303, 307, 309, 310, 325, 336 and 554.

### Amendments

[48 FR 50333, Nov. 1, 1983, as amended at 49 FR 7130, Feb. 27, 1984; 50 FR 48599, Nov. 26, 1985; 51 FR 19840, June 3, 1986; 62 FR 4922, Feb. 3, 1997; 68 FR 12767, Mar. 17, 2003]