820.1 Scope.
This article covers coaxial cable distribution of radio frequency signals typically employed in community antenna television (CATV) systems.
From the Handbook:
Article 820 covers the installation of coaxial cable for the distribution of radio frequency (RF) signals associated with closed-circuit television, cable television, and security television cameras. This article also covers interior coaxial cable for radio and television receiving equipment. Article 830 was added to the 1999 Code to cover network-powered broadband system installations.