Keep in mind we're not in the early 2000's any more. All over the air channels also have several sub channels, depending on band width. For example Channel 2, could carry the games on 2.2, 2.3 or whatever. Most of these are on cable. The Tigers and the station would probably have to negotiate "carriage rights" with cable operators across the state, and say into Northern Ohio, etc.
That's the easy part, assuming there is side channel capacity. I would assume they could also set up something with MLB media to do this as well as far as production costs. Keep in mind, someone needs to pay for it, so a portion of the costs fall on the fan. If nothing else this would keep them on cable, and give the fans who still use antenna TV a chance to see gaames.
Out of market would be carried on the MLB.TV app as before.
Just spitballing here...but I see them setting up something similar to what they had with FanDuel in house, with the help of their MLB.com agreement.