What is the max power (dBm) a AM receiver can get in the real world? Let us say
the receiver is sitting very close to a station antenna, the station has the
max power FCC permits.


The "blackout" zone is 1 volt/meter.

Any station, regardless of its power, has such a zone.

Good city service is 25 mV/m.

The area covered by the 25 mV/m signal is a function of frequency, power and
ground conductivity.