Clients using 2-way Satellite Internet service connect
to the internet via an Earth Station consisting of a parabolic
microwave antenna -- a satellite dish with receiving and
transmitting capabilities. The earth station sends and receives
signals to a satellite in geostationary orbit around the Earth.
The satellite communicates with another earth station which is
connected to the Internet. 2-way satellite communication means
no other terrestrial links are required -- no phone line needed.
http://en.wikipedia.org/wiki/Satellite_internet