The reason WPWR-TV/WBBS had a shared agreement was because Newsweb Corporation wanted to get on the air right away. They already held the license for an unbuilt channel 56 (then a commercial license), but couldn't locate in Chicago at the time on 56. The shared agreement ended in 1986 when Newsweb bought the WBBS license, due to WSNS going to full time Spanish a year earlier, & WBBS's ratings dropped. Newsweb could have stayed on 60 after buying out WBBS's license, but for some reason, they wanted to change channels. The company that now runs WYIN was about to acquire the dormant channel 50 license (then a non-commercial license with the call letters WCAE) when Newsweb wanted to buy it, & have the licenses swapped, making 50 commercial to locate in Chicago, & 56 to become non-commercial, & is now WYIN. 56 couldn't locate in Chicago due to 60 broadcasting in Chicago, but also because 55 is licensed to Kenosha Wisconsin, & that station signed on in 1988 from a tower located in Pleasant Prairie Wisconsin, making 56 short-spaced. Had that not been a problem back then, WPWR-TV would have signed on channel 56 instead of 60. The short-spacing issue back then was resolved over 10 years later when 55 relocated their transmitter to Franksville, WI in Racine County, & 56 would have had to co-locate on the Sears Tower to protect channel 60. Money was the reason WYIN didn't relocate their analog transmission & build out the digital transmission there too, or WYIN would have relocated there, over the objections of WTTW & WYCC, who did not want WYIN transmitting in Chicago, & tried ot get the FCC to deny WYIN's request, but their requests were denied.