What is the best cables for HD setup?

How Can I Improve My Satellite-Terrestrial Aerial-Television Setup?

• We run a fairly complex system of coaxial cables throughout the house to ensure our three HD-Ready TV's can receive pictures from both the Terrestrial Aerial on the roof and Sky box located in one of the bedrooms. As the system is fairly complicated a diagram can be found here: http://img26.imageshack.us/img26/2904/tvsystem.jpg Whilst the system is OKAY - all three televisions get the one Sky channel being provided by the box, and may independently choose terrestrial channels, the picture is often a grainy, with some ghosting and lines. This is predominantly an issue with the Sky picture more than Terrestrial - sometimes it's better to watch football on the latter! Is there any way to improve this setup? The Sky Box, Terrestrial Aerial and TV's cannot be moved. I was thinking along the lines of introducing HDMI cables, although I do not know what type of repeater/booster setup would be required to stop signal loss over the distances.. And whether or not interference may be a problem as many of the cables in the current set up run next to each other for long distances in the attic. The Coaxial cables themselves are fairly old (apart from the one to TV 3) but of the thicker higher quality sort. The powered booster/splitter is fairly new. I've already tried removing the Terrestrial Signal from the system, with no big difference to fuzziness and ghosting on the Sky picture. I have also made sure all connections are tight and static free. Your suggestions and guides would be appreciated!

• Answer:

  Fairly complicated, it certainly is. Do you have or want Sky subscription channels? If you only have Freesat, you can fit a quad LNB on the dish, and run separate cables to separate boxes for the other TV's. Cable quality is a factor to look at. I refer you to this web site for a lot of good information, as it is a lot more informative than anything I can say. http://www.satcure.co.uk/tech/satindex.htm