I'm not sure about TV but I know one school that broadcast's their games on radio. The Rochelle Hubs broadcast all their football, basketball and baseball games on WRHL 1060am. I have tried to pick up a Rochelle / Geneva baseball game in the past and the reception wasn't that great.
Well I can say for certain that last year the games at "state" were NOT on TV. Some local cable channels used to do games, but I have not seen any in years. Many years ago the state title games were on TV, but not recently.
Then come on down (or up depending on where you are) to Joliet to see the games live. Jackhammer (Silver Cross) Stadium is a beautiful facility, easy to get to, free parking available ... it's baseball heaven.