CADXer and John.

For WSFS there is a major null at night to the W and NW. (image below) At night I can hear WWJ easily in Elgin, DeKalb, Huntley, Rockford. Chances are in most of Milwaukee county, you will not.

WYLL also uses that technology which cuts down power consumption even though they are @ 50KW. When there is little or no modulation, the power will vary and drop from its peak. I am not certain, but common sense dictates less carrier or modulation will allow other signals underneath it to pop in and be audible.

Z