There are some "clear channel" (now "Class A") AM stations that have huge listening areas particularly at night. These are distinct from Clear Channel the compa

There are some "clear channel" (now "Class A") AM stations that have huge listening areas particularly at night. These are distinct from Clear Channel the company. These stations mostly broadcast at 50kw in the USA and have a bunch of added protections such as distant AM stations on the same frequency having to reduce their broadcast power at night. More info: https://en.m.wikipedia.org/wiki/Clear-channel_station https://en.m.wikipedia.org/wiki/Clear-channel_station There's really not much about it in the article, but my impression growing up in Chicago (which has at least 5, currently 2 sports, 2 talk and 1 news) was that part of their role was also to be emergency information destinations.