Can't answer about the splitter part, but you need a hardware device that will capture HDTV. That could be a tv/video card, a capture card, or something like the Canopus or ADS Pyro products. You just need to read reviews, and make sure that your device will support capture of HD. Some of the Radeon and Geforce video cards have vivo, (video in and video out), and are able to capture HDTV. You will also need to ensure that the device you choose can record via timed recording (if that is what you want).