The flatness makes this not a workable line of sight environment without towers due to the Fresnel zone though, the topography is the only reason this 43km link worked. Need to find an ugly hilly region, a much harder task than an ugly flat region :)
https://en.wikipedia.org/wiki/File:Fillmore_03_Hwy_33.jpg
Flat. Flatter. Flattest. With virtually zero change in elevation there is very little to see but pavement and sky.