There are a number of competing systems in use, with early adopters having used C-band satellite dishes of many feet in diameter to receive signals which were originally analogue FM, later digital using the Motorola-proprietary Digicipher II system or later still going to Ku-band and under one-metre dishes with most often the international DVB standard. The following are the types of Free-to-air Receivers: Satellite Dish A satellite dish is a special type of parabolic antenna designed with the purpose of transmitting signals to and/or receiving from satellites. A satellite dish is a particular type of microwave antenna, which comes in varying sizes and designs, and is most commonly used to receive satellite television. Satellite Television Satellite television is television delivered by way of communications satellites, as compared to usual terrestrial television and cable television. In many areas of the world satellite television services supplement older terrestrial signals, providing a broader range of channels and services, including subscription-only services. Set Top Box The term set-top box describes a device that connects to a television and some external source of signal, and turns the signal into content, which is then displayed on the screen. The signal source might be an ethernet cable, a satellite dish, a coaxial cable, a telephone line, Broadband over Power Line, or even an ordinary VHF or UHF antenna. This means any or all of video, audio, Internet webpages, interactive games, or other possibilities. A set-top box does not always need to contain a tuner of its own. A box connected to a television set's SCART connector is fed with the baseband television signal from the set's tuner, and can ask the television to display the returned processed signal instead. This feature is used for decoding Pay TV, and in the past was used for decoding teletext, before decoders became built-in.
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