Sinclair Broadcast Group, Inc. operates as a television broadcasting company in the United States. It owns or provides various programming, operating, sales, and other non-programming operating services to television stations. The company broadcasts free over-the-air programming, such as network provided programs, locally-produced news, local sporting events, programming from program service arrangements, syndicated entertainment programs, and internally originated programming to television viewing audiences in the communities through its local television stations. As of December 31, 2018, it owned, operated, and/or provided services to 191 stations in 89 markets, which broadcast 605 channels. The company also owns and operates various networks carried on distribution platforms; and Tennis Channel, a cable network that includes coverage of various tennis' top tournaments and original professional sport, and tennis lifestyle shows. In addition, it offers digital agency services; and broadcast related technical services to the broadcast industry, as well as designs and manufactures broadcast systems, including transmitters and antennas. Further, the company provides sign design and fabrication services; and invests in various real estate ventures, including developmental land, and operating commercial and multi-family residential real estate properties and apartments, as well as private equity and structured debt/mezzanine financing investment funds. Additionally, it offers Tennis Magazine; and operates Tennis.com, an online tennis platform. The company was founded in 1986 and is headquartered in Hunt Valley, Maryland.

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