A broadcast relay station, satellite station, relay transmitter, broadcast translator (U.S.), rebroadcaster (Canada) or repeater (two-way radio), Complementary station (Mexico), is a broadcast transmitter which repeats or transponds the signal of another radio station or television station, usually to an area not covered by the signal of the originating station. They may serve, for example, to expand the broadcast range of a television or radio station beyond the primary signal's coverage area, or to improve service in a part of the main coverage area which receives a poor signal due to geographic constraints. These transmitters may be (but are not usually) used to create a single-frequency network. They may also be used by a radio station on either AM or FM to establish a presence on the other band. An example is WECK; an AM station which recently purchased an existing FM translator. It states the FM frequency and then its AM frequency when identifying the station. Less commonly, a rebroadcaster may be owned by a community group rather than the owner of the primary station. Another example is WHLS/WHLX of Port Huron, MI which purchased a translator, and shortly after that switched to an Alternative Rock format only mentioning their FM translator (except for their legal top of the hour ID) Neither AM frequencies are mentioned.

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