all over the dial

Found on many different television or radio stations. (On older TV and radio sets, different stations were selected by turning a large dial.) Whenever you drive around in this part of the country, you start to hear religious broadcasts all over the dial. There are always cheesy B movies all over the dial around this time of night. It's annoying enough being an insomniac, and then there's only infomercials all over the dial in the middle of the night!