To get UHF thru to the tvs as well you need a satellite/rf diplexer before the splitter. Dish in the sat side, UHF from the sky box in the other side.
In each room you can either put another diplexer to separate them, or if the boxes you get have a LNB loop thru that will normally pass the UHF as well so can try cabling that to the antenna of the tv before investing in more diplexers.
All that stuff needs short cables with F plugs on them. lots of places will make them if you order them, dont use anything less than RG6 - there are plenty of crap cables on trademe that are just RG59 or worse. They will stuff things up.