Microwaves use line of sight propagation. Microwaves frequency ranges from 1 to 300 GHz. Microwaves are used in cellular phones, satellite networks and wireless LANs. Microwaves are unidirectional. It is useful in unicasting i.e. one to one communication. To travel longer distances, the antennas must be taller. There should not be any obstacle in between. Usually mountain tops are the preferred positions for the antennas to avoid obstacles. Microwave can travel for one direction at…"Wireless Transmission and Microwaves."