Sky HD - connecting up in multiple rooms

[JuniorD]

I'm a bit of dummy when it comes to Sky TV and HD so need some advice.
At present we have Sky+ HD in our main room. We want to get Sky in three other rooms using those
magic eye things which enable you to piggyback off the main Sky+ box.

Trouble is, we would like at least one of those piggyback connections to enable us to watch the HD in one of the additional rooms. Is this possible and what is required? Does it take specialist, expensive cabling?

Thanks in advance.

[JuniorD]

Thanks chaps, much appreciated! Seems straight forward enough in principle. That will be my project for the next week, all other important household jobs now bumped down the list. Thanks once again.