Microwaves are high-frequency radio waves that travel in straight lines through the air. The information travels through the air and into satellite dishes where the data in decoded and sent through copper lines to a host. Microwave transmission is only of the faster ways to transmit information, but are only useful for distances up to 30 miles. Because microwaves travel in a straight path, the curvature of the earth only allows the information on travel short distance. Microwaves are more commonly used for information transfer in larger cities and on larger college campuses.