Antennas
While cable and satellite technologies now give good TV reception to many, other viewers may need a rooftop antenna to get a good picture. And even though the FCC now allows satellites to offer local programming in some areas, dish companies do charge extra fees for that. So some viewers often choose to use an antenna along with their satellites.
There are different frequencies for different TV and radio stations, so it is possible to get antennas that receive just one type of frequency, and others which pick up more than one type.
Different antennas are necessary for different locations. Antennas far away from transmitters need to be large and often installed high to pick up signals. Antennas in in heavily populated areas close to transmitters do not need to be as large, but they need to be able to screen out interference.
-- Tips courtesy of HomeAdvisor.com