https://en.wikipedia.org/wiki/Station_identification#United_...

  The United States' Federal Communications Commission (FCC) enforces specific requirements for identification that must be followed by all terrestrial radio and television stations. Stations must, when they sign on, sign off, and as close to the top of each hour as feasibly possible (such as within a "natural break" in programming, like a commercial break), present a visual (television) or aural (radio) station identification that contains, at minimum, the station's callsign, followed by its designated city of license. As a courtesy, top-of-hour identifications may also contain additional information, such as frequencies and a declaration of the station's ownership.[6] Only the name of the licensee, the station's frequency or channel number as stated on its license, and/or network affiliations, may be inserted between the call letters and station location. 

https://en.wikipedia.org/wiki/Sign-on_and_sign-off#Sign-on/s...

  Technical information is provided. This can include station identification (call sign and city of license), transmitter power, frequency or channel number, translators used, transmitter locations, list of broadcast engineers, and/or studio/transmitter links (STL).

In my experience, the 1980s were a time when some TV stations would still sign off for a few hours, perhaps only on Sunday night. It is unusual today in the United States, for commercial radio or TV stations to sign off and sign on. When stations did sign off/on, I did hear some of them broadcasting an extended Station ID. A man's voice would call out those details listed. They would mention what mountain peak their main transmitter was on, and the wattage of "peak effective radiated power". Since I lived near the Mexican border, there were stations with Mexican licenses who broadcast in English programming, except for the Mexican National Hour. "Border Blasters", as they were called.