Have a look at 1KW 1130 AM on Hilton Head Island, SC (WHHW-AM). At 12 noon on any day, I can easily ride that signal down the Space Coast of FL and about 10 miles inland. That's the entire coast of GA, part of SC and half of FL.
That's pretty much as shown for them (link below). Nice signal for just 1 kW.
http://s20.postimg.org/3udd10j1p/WHHW_Groundwave.pngR. Fry
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