47 CFR § 80.923
Antenna system
February 16, 2021
An antenna must be provided in accordance with the applicable requirements of §80.81 of this part which is as efficient as practicable for the transmission and reception of radio waves. The construction and installation of this antenna must insure proper emergency operation.
[51 FR 31213, Sept. 2, 1986, as amended at 56 FR 19302, Apr. 26, 1991]