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What is good about the Panasonic RF2200 radio?
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Some thoughts: o Line of site is out. Dist to horizon for tower ht h earth radius R is sqrt((R+h)^2R^2) or sqrt( 2 R h + h^2 ), effectively sqrt( 2 R h ). For units of miles sqrt(2 R) is approx 90 and sqrt(2 R h) is the same. Insert at end of sentence: "for h=1" ^^^^^ So for two towers a mile high, each is 90 mi from horizon for a total of 180 mi. For ht of 0.1 mi (528') each, get 180 * .316 or about 57 mi total. 
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