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 … 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

• 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 States table, for the former class I-A and class I-B stations. General Order 40 allocations are in bold.
Second is the … See more

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