Since satellites communicate in the 4 - 13 GHz band and sucessfully send signals 23,000 miles with 20 Watt amps, 5 GHz, if given enough power, could go 5 miles . . . so long as you have "line of sight," and that is the clincher! -- "Remember, Comrade, people who are willing to destroy an efficient telephone system may not be playing with a full deck."