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This is often necessary because the best locations for an antenna are on top of a mountain, where a much shorter tower is required, but where a studio is completely impractical. Even in flat regions, the center of the station's allowed coverage area may not be near the studio location, so the antenna must be placed several miles or kilometres away.

Depending on the locations that must be connected, a station may choose either a point to point (PTP) link on another special radio frequency, or a newer all- digital wired link via a dedicated T1In telecommunications, T-carrier is the generic designator for any of several digitally multiplexed telecommunications carrier systems originally developed by Bell Labs and used in North America and Japan. The E-carrier system, where 'E' stands for Europe or E1E1 is: E-carrier level 1, a telecommunications term E1, a Mazda piston engine. line. Radio links can also be digital, or the older analogFor the Analog Science Fiction and Science Fact publication, see Astounding Magazine. For the server log file analyzer, see Analog (program). An analog (American English spelling) or analogue (British English spelling) signal is any continuously variable type, or a hybridThis article is about a biological term. See hybrid (disambiguation) for other meanings. In biology, hybrid has two meanings. The first meaning is either the offspring of two different species, or of two different genera. The second meaning of "hybrid" is of the two. Even on older all-analog systemFor the Macintosh operating system, which was called System up to version 7. 5, see Mac OS. A system is an assemblage of inter-related elements comprising a unified whole. From the Latin and Greek, the term "system" meant to combine, to set up, to place ts, multiple audio and dataA datum is a statement accepted at face value (a "given"). Data is the plural of datum''. A large class of practically important statements are measurements or observations of a variable. Such statements may comprise numbers, words, or images. Etymology T channelFor the geographical meanings of this word, see channel (geography). In communications, a channel is the "path" or "route" which a message follows, as it is transmitted between a communication source and a receiver. More specifically, in telecommunications can be sent using subcarrierA subcarrier is separate analog or digital signal carried on a main radio transmission, which carries extra information such as voice or data. More technically, an already- modulated signal, which is then modulated into another signal of higher frequencys.

Stations that employ an STL usually also have a transmitter-studio link (TSL) to return telemetry information. Both the STL and TSL are considered broadcast auxiliary services (BAS).