We had the same trouble about 18 months ago at Rachel's parents place. Sky blamed the tree's in the garden (funny seeing as the trees have been there for 40 years and hadn't caused a problem for the forst couple of years the Sky was in). Told them to shove it in the end and now have NTL instead.

They're a bunch of fookers to deal with though You'll need some of these " " while they ask you a load of stupid questions like:

Is it plugged in?

Is it connected to the Telly?

Are you on the right channel?