Who are the customers of a radio station?

Answer 1

Basically, the listeners, who are the patrons.

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Another contributor has a different view:

Not at all. There's no business agreement or transaction between a radio station

and its listeners. The customers of a radio station are its advertisers. The advertiser

pays the radio station, and the radio station delivers the ears of the listeners to the

advertiser.

The business transaction takes place between the advertiser and the operator of the

radio station. The listener is the product that the customer buys.