[Jason1]

can do it for less than a fiver. All you need is a 3 way passive spliter, coax, 11 male connectors and 3 rf connectors . From the output of your stb connect a small amount 30cm or so of coax with a male connector at each end one to fit to the stb and one for the splitter. Connect from the stb into the IN connection on the splitter which is at the top now you have 3 connections at the bottom of the splitter cut the required amount of coax needed to serve the remaing tv's you need to add male connectors to each end of the coax attaching a rf to the end that goes in the tv can get a piture of these if need be although you can only change channels from room where stb is