Lower angle skip, such as WFAN being received in Europe, Africa, Caribbean,
etc. would definitely be affected. In the extreme, the shape of the
antenna pattern would look more like the one for groundwave.
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Below is a link showing the complete 0.15 mV/m groundwave contour of WFAN,
to approximately the same map scale as the skywave chart linked earlier.
Note that even though this GW field intensity is lower than the 0.25 mV/m
contour shown for the 50% nighttime skywave of WFAN, the distance along the
surface of the ocean to that GW contour is less than for the skywave contour
for those paths.
http://s20.postimg.org/r9ceghfu5/WFAN_Groundwave.gif
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