Yeah, I was looking for the affiliate guide yesterday but all I could find was the list from last year. Here's my best guess on some of these channels based on last year. FYI - I would be in mediacom territory just outside of Champaign.
If the game is listed as ABC7 (WLS) in Chicago, it is likely on WCIX. For me this is channel 3.2.
If the game is listed as WGN Chicago, it is likely on WBIU (CW). For me this is channel 23.1.
If the game is on Comcast Sports Net (CSN) Chicago, I believe that is your only option. In my area this is mediacom QAM channel 55.15. It looks like CSN+ is mediacom QAM channel 58.6. Since NBC Sports has the same ownership as Comcast Sport Net, I was hoping the NBC Sports streaming options would add CSN games (cable/satellite login required), but so far no luck.
If the game is on ESPN/ESPN2 you can stream the game on a variety of devices, provided you have a cable/satellite login. ESPN is QAM Channel 55-5 on mediacom around here, ESPN2 is 55-13.
Not sure if this was discussed here, but there was a class action lawsuit against MLB.TV that reached a settlement recently. It looked like there may eventually be hope for them offering a streaming option for in-market games (i.e. no blackouts) on MLB.TV. Unfortunately that day isn't here yet.