Ive used a quad before seemed ok...but 8 thats just mad. 
Wouldn't they more leads used effect quality.?
Also would the length of lead make a difference....say 10m 20m 30m im assuming there must be a max length before picture quality is effected. :-/
Interesting point.
I am putting the dish at the rear of the building. This will be above my Study and I was going to put a sky extender on to go into the kitchen. Main box I would have used a basic sky box but would have liked a PVR or computer media centre in there as well.
But then I need cables to go either arround the building or through it. Shortest distance at least 10M and that would be for HD to the living room. Even then I need to put TV into there as I will be setting that up with annother TV as a Gaming room, and games coneles and Computer etc but dont know if I can extend Sky HD.
Ultimately I want as many recording optons as possible where ever I am I can click and record. Even if it just my old Video or DVD recorder.
Also like Martin I have loads of VHS thet I need to convert to disk and then dump the tapes.
As you can tell, this is a subject I hadnt really thought about untill it was getting late. :-/