After World War II, the University of Illinois at Urbana-Champaign hosted the National Association of Educational Broadcasters for the establishment of broadcast allocations (AM/FM radio and TV channels) for non-commercial education programming. The outcomes from these meetings established the foundation for National Public Radio and the Public Broadcasting System.

The U of I applied for a television license soon after the FCC lifted its freeze on new licenses. However, educational television was a new concept at the time, and most of Illinois' commercial broadcasters violently opposed the prospect of the U of I owning a television station. After a bill that would have forced the university to withdraw its application was narrowly defeated in the legislature, the Illinois Broadcasters Association funded a suit by a restaurant owner in Evanston claiming that the Illinois Constitution did not allow U of I to operate a television station. The case went all the way to the Illinois Supreme Court, which ruled in favor of U of I.

WILL-TV first hit the airwaves on August 1, 1955 from makeshift studios underneath Memorial Stadium. Originally airing for only a few hours at night, it began airing during the day in 1958 and added Saturday programming in 1974, four years after joining PBS.