Communication satellites in geostationary orbit have the marvelous ability to permit information exchange across very large distances. These satellites can accomplish this feat because they are high enough above the earth's surface to be in the "line-of-sight" of microwave transmitters and receivers many thousands of miles apart. Although communication satellites were first used to relay information between continents, by the end of the 1970s they were being used increasingly to transmit information within large countries. This more recent usage, known as "domestic satellite service," is an attractive substitute for lengthy terrestrial microwave or cable networks.
Martin A. Rothblatt,
The Space WARC: International Accommodations for Satellite Communications,
Mich. J. Int'l L.
Available at: https://repository.law.umich.edu/mjil/vol5/iss1/2