John, daytime signals of all three at my location in the western suburbs are very good. Best of course is WYLL with their 50 kW from Des Planes 8 miles away from me. Next is WSFS with good signal 16 miles away. WKBM comes 3rd 35 miles away, but with good signal.

Nighttime is quite different. WKBM is easily nulled with a loop antenna. WSFS moves 31 miles southeast of me and in partial nulls I can hear WWJ Detroit and WAKM Franklin, TN. As for WYLL they also move away from me (26 miles) at night and their signal is weaker. Sometimes I am able to hear WCRT Donelson underneath WYLL. Gone are the days when they would go off at night during the WJJD days, making reception of KSL quite easy in Chicago area.

Speaking of WYLL, it has been reported by DXers that they were off the air during the night in recent months, so there might be transmitter issues at their Lockport site.