Wikipedia
Sportsvision was a subscription sports television service founded by Chicago White Sox owners Jerry Reinsdorf and Eddie Einhorn, and media mogul Fred Eychaner. The service broadcast live sporting events.
In April 1982, WPWR-TV, then on Channel 60, dedicated a large percentage of its broadcast schedule to Sportsvision. To access the service, viewers had to buy a TV set-top converter and pay monthly subscription fees to watch a number of sports broadcasts. Ultimately, as cable television gained a foothold in the Chicago area, the pay-TV business model dissolved and, in January 1984, Sportsvision moved to cable. In 1989, it was unscrambled and renamed SportsChannel. In 1997, SportsChannel was purchased by Fox Sports Net. Now starting in October 2004 through current day the games reside on Comcast Sports Network Chicago which is owned by Chicago sports owners and Comcast's NBC venture.