When I lived in California, I used to listen to the clear channel station from Oklahoma City at night. I'll bet it went even farther to the east since it would have been downwind.1933
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WCCO is an AM station on 830 kilocycles (using the 1933 term) in Minneapolis. Must have been carrying college football games. They were Class A, 50 kW in 1933 and they were on 810 kHz back then (830 today and still Class A). They had two 300 foot towers to ensure a wide coverage.
I wonder what sort of signal fight they had with WGY in Schenectady NY on the same frequency? WCCO had their frequency changed to 830 kHz in 1941 when the FCC moved many Class A stations around so they didn't have so much night interference. They changed to a single 654 foot tower in 1939, and that was probably to knock down WGY in their primary coverage area.
They would have had a huge footprint during the day in 1933. I imagine these signs up to 1000 miles out from Minneapolis. Wickedly successful advertising, I imagine.
These days, WCCO is also a TV station in Minneapolis, the old channel 4.