"Tam/WB2TT" wrote re WABC night time reception in PA:
Richard, I think he is just too close for night time sky wave,
and too far for ground wave.
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Quoting the original post, "I live approx 80 miles from the xmitter of
station WABC (New York) 50,000 watts. During the day my reception is
good-to-very good. After sunset however, the signal is poor to
unlistenable -- due to fading and man-made
QRM."

WABC radiates the same power from the same radiator 24 hours a day, and
provides good daytime reception at this receive location, so it is not too
far for the groundwave.

The ground wave is more or less constant day and night, so it is likely that
the poor/unlistenable signal there at night must be the result of
interference to the groundwave from whatever high-angle skywave WABC
produces, plus the higher co- and adjacent-channel interference usually
present at night.

RF