Assuming 2 identically equipped stations operating
mid day on 40m SSB, how far apart would they have
to be to see differences in propagation from a station
say 500 miles away?

Remember - both stations are identical - same rig, same
antenna (Inverted V @ 40'), same local noise levels, same
radiation patterns.

What I'm trying to visualize is the way a given signal hits
a city and whether an instance where station A can hear
better than station B is a problem with station B or simply
propagation patterns of an inbound signal.

Hope that makes sense..... lol!
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73 de Ken KGØWX - Flying Pigs #-1055
Elecraft K2 #4913