What is the main idea of the paragraph. have yo ever wondered how images find there ways onto televisions screen. some tv shows are delivered to homes through over air broadcast . this method send electromagnetic waves from a transmitter at a tv station to the antennas in people's homes. cable tv uses a different method it delivers signal directly to a tv cabel. this direct physical connection usually means that viewers get a better image of better sound. satellite tv themes television shows all over the world from satellites that orbit earth. a satellite dish receive the signal. direct broadcast satellites can transmit over a very wide area but they cannot deliver local programs.