TIL The FCC policy covering broadcasting stations limits them to call signs that start with a “K” or a “W”, with “K” call signs generally reserved for stations west of the Mississippi River, and “W” limited to stations east of the river.

Read more: https://en.wikipedia.org/wiki/Call_signs_in_the_United_States?wprov=sfti1

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  1. 104 AM, FM and TV stations in the United States are assigned three-letter call signs. The AM stations usually date back to before April 1922, when four-letter call signs became the norm. The FM and TV stations are usually associated with one of those AM stations, like WGN-TV in Chicago which is associated with WGN AM radio, or WLS-TV in Chicago which is associated with WLS AM radio.

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