Crazy how far AM radio travels at night. Before Sirus satellite - I would routinely get Avs' / Rockies/ Nuggets games here in C.IA all the way from Denver. 600 miles right on the nut. Maybe the 600 miles is something like a sweet spot.
Prior to solar radiation penetrating the atmosphere this morning, conditions allowed me to receive AM 1120 KMOX from St. Louis MO a distance of just over 600 miles from the rare 1930's Blaw-Knox "Diamond" antenna.
About 600 miles North of me is prediction of a 24" Blizzard.