Here is the FCC blurb on IDs:
"
Station Identification. Stations must air identification announcements when they sign on and off for the day. They also must broadcast these announcements every hour, as close to the start of the hour as possible, at a natural programming break. TV stations make these announcements on-screen or by voice only. Official station identification includes the station’s call letters, followed by the community specified in its license as the station’s location. Between the call letters and its community, the station may insert the name of the licensee, the station’s channel number, and/or its frequency. It may also include any additional community or communities, as long as it first names the community to which it is licensed by the FCC. TV stations also may identify their digital multicast programming streams separately if they want, and, if so, must follow the format described in the FCC’s rules."
The Public and Broadcasting TABLE OF CONTENTS Introduction The FCC And Its Regulatory Authority The Communications Act How the FCC Adopts Rules The FCC and the Media Bureau FCC Regulation of Broadcast Radio and Television The Licensing of TV and Radio Stations Commercial and...
www.fcc.gov