Query: Satellite transmissions are extremely small and irrelevant.

Relevant passages:
Terrestrial television <=SEP=> Terrestrial television or broadcast television is a type of television broadcasting in which the television signal is transmitted by radio waves from the terrestrial ( Earth based ) transmitter of a television station to a TV receiver having an antenna . The term is more common in Europe , while in North America it is referred to as broadcast television or sometimes over-the-air television ( OTA ) . The term `` terrestrial '' is used to distinguish this type from the newer technologies of satellite television ( direct broadcast satellite or DBS television ) , in which the television signal is transmitted to the receiver from an overhead satellite , and cable television , in which the signal is carried to the receiver through a cable .   Terrestrial television was the first technology used for television broadcasting , with the first long-distance public television broadcast from Washington , D.C. , on 7 April 1927 . The BBC began broadcasting in 1929 and had a regular schedule of television programmes in 1930 . However , these early experimental systems had insufficient picture quality to attract the public , due to their mechanical scan technology , and television did n't become widespread until after World War II with the advent of electronic scan technology . The television broadcasting business followed the model of radio networks , with local television stations in cities and towns affiliated with television networks , either commercial ( in USA ) or government-controlled ( in Europe ) , which provided content . Television broadcasts were in black and white until the 1960s , when color television broadcasting began .   There was no other method of television delivery until the 1950s with the beginnings of cable television and community antenna television ( CATV ) . CATV was , initially , only a re-broadcast of over-the-air signals . With the widespread adoption of cable across the United States in the 1970s and 1980s , viewing of terrestrial television broadcasts has been in decline ; in 2013 , it was estimated that about 7 % of US households used an antenna . A slight increase in use began after the 2009 final conversion to digital terrestrial television broadcasts , which offer HDTV image quality as an alternative to CATV for cord cutters .

Digital radio <=SEP=> Digital radio is the use of digital technology to transmit and/or receive across the radio spectrum . They may refer to digital transmission by radio waves , including digital broadcasting , and especially to Digital audio radio services .   The term is also applied to radio equipment using digital electronics to process analog radio signals .

Satellite television <=SEP=> Satellite television is a service that delivers television programming to customers by relaying it from a communications satellite orbiting the Earth directly to the customer 's location . The signals are received via an outdoor parabolic antenna usually referred to as a satellite dish and a low-noise block downconverter .   A satellite receiver then decodes the desired television programme for viewing on a television set . Receivers can be external set-top boxes , or a built-in television tuner . Satellite television provides a wide range of channels and services . It is the only television available in many remote geographic areas without terrestrial television or cable television service .   Modern systems signals are relayed from a communications satellite on the Ku band frequencies ( 12 -- 18 GHz ) requiring only a small dish less than a meter in diameter . The first satellite TV systems were an obsolete type now known as television receive-only . These systems received weaker analog signals transmitted in the C-band ( 4 -- 8 GHz ) from FSS type satellites , requiring the use of large 2-3 meter dishes . Consequently , these systems were nicknamed `` big dish '' systems , and were more expensive and less popular .   Early systems used analog signals , but modern ones use digital signals which allow transmission of the modern television standard high-definition television .   Different receivers are required for the two types . Some transmissions and channels are unencrypted and therefore free-to-air or free-to-view , while many other channels are transmitted with encryption ( pay television ) , requiring the customer to subscribe and pay a monthly fee to receive the programming .