Digital Audio Radio Service
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Digital Audio Radio Service or DARS is the FCC term for digital radio services.
The most popular type of DARS in the U.S. is SDARS: Satellite Digital Audio Radio Service, operated by XM Radio and Sirius.
XM and Sirius both operate in the 2.3-GHz S band, from 2320 to 2345 MHz.
In areas with weak signals, such as downtown areas with tall buildings or parking garages which block satellite signals, Terrestrial repeaters are installed to re-broadcast the signal to ensure continuous coverage.
