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But the local radio station is KBBL: stations beginning with K (both television and radio) are west of the Mississippi River; Michigan is east of it.

KDKA Pittsburgh PA, WACO Waco TX. There are more examples, the FCC was a little late in setting up the rules. Four letters is the norm, but there is WLS and WGN in Chicago. Rules were meant to be ignored. The K west West border was move to The Mississippi River in 1923.