... So I would expect the skywave plot to be elongated to the east through
south at the 0.25 mV/m contour line. It appears that the data was generated
using a signal strength prediction program as "50% of the time" was used in
the qualifying remarks (50% implies a median value - which likely comes
from our monthly median model of the ionosphere). But the prediction
program didn't look at ground around the antenna.
The link below leads to the FCC methodology and formulae used to determine
the skywave signals of AM broadcast stations.
http://www.gpo.gov/fdsys/pkg/CFR-2012-title47-vol4/pdf/CFR-2012-title47-vol4-sec73-189.pdf
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