Sixty medium wave frequencies were set aside in 1941 under the North American Regional Broadcasting Agreement (NARBA) for use by usually only one, although in some cases two or three, AM stations, covering a … See more

• Regulation of radio broadcast in the United States
• Clear Channel Communications See more

• AM Station Classes - Clear, Regional, and Local Channels (FCC Website)
• Big USA, Mexico, and Canadian AM radio stations See more

The following two tables show all of the class-A stations in North America.
First is the Canada, Mexico, and contiguous United … See more

In the early days of radio, regulators had difficulty reducing interference between stations. There were two major limitations: a lack of good frequency control during the 1920s, resulting in … See more