It doesn't. Every Iowa basketball game was broadcast state wide back in those days. You couldn't watch ISU, Drake, or even Kansas. Many didn't yet have cable, so Iowa basketball was pretty much it. They drew broadcast market shares which today would be unfathomable. A lot of kids grew up Hawkeye fans because they didn't know any different.
You could watch ISU games in the mid '90s. I'm not sure what it was like before that.