Rolling across northern Ohio this morning, I monitored three of the Chicago clears (forgetting about WLS until it was too late) on my stock (but excellent) Hyundai radio. WBBM 780 faded to near hash 95 miles into Ohio. WGN 720, 115 miles in. WSCR 670, 122 miles in. By Google Earth measurement, that's almost exactly 278 miles from the WSCR transmitter. Make of that what you will.
Meanwhile, in my NJ hotel room with a northeastern exposure, WSB 750 is coming in nicely on my Sony SRF-A100. Next door, CFZM 740 Toronto is in a fight with around-the-corner WJFP Chester, Pa., 50 kW vs. 6 kW, respectively. WJFP carries the Yankees, even though it's in the Philadelphia market and 660 WFAN bombs in.