The Rest of The Story with Indiana's confusing time situation was that prime time was 8-11 in the fall and winter months and 7-10 during Spring and Summer. That all changed when the General Manager of WTHR-13, Indianapolis, discovered he could take a prime-time Mountain Time feed of NBC and it would be 8-11pm EST/CDT. Soon everyone in Indianapolis had the same schedule (by the clock) all year by delaying network programming during the spring and summer. When I worked in Lafayette, we used three one-inch machines, rolled 45 minutes apart, to do the delay (what a pain). Terre Haute, South Bend and Fort Wayne soon followed, and that gave some places that could receive other markets 2 chances to see everything-Richmond, Indiana got both Dayton and Indianapolis, some parts of western Ohio got Fort Wayne along with Dayton or Toledo.
Point of clarification: NBC and the other networks have never done a Mountain Time feed. The Denver network affiliates tape the Eastern/Central feed and play it back back one hour later, and feed it to other affiliates on Mountain Time. Worked fine as long as there wasn't a news bulletin.