OK, apologies if I offend anyone, but I am getting really fed up with these "dumb" distribution questions.
Terrestrial TV and the Sky RF output are both UHF signals, which, depending on where you live, and what RF channel the Sky box is set up to output, may interere with one another - more later.....
99% of distribution in peoples homes occurs in the loft. An input, (Terrestrial or Sky RF output), is distributed to other rooms in the house via a distributor taking an input, (terrestrial or Sky RF output) on it's input connector and distributing it's output to all the other rooms via it's output connectors.
(Note carefully that a signal input, (Terrestrial or Sky RF output), to an output of a distributor will not pass through to other outputs).
To enable two inputs, (Terrestrial and Sky RF output), to be distributed then those two inputs have to be combined prior to the input of the distributor. A simple Y or T combiner, or the Sky box itself, will do that.
If "Magic Eye" control from the other rooms is required then more research is required to find compatible distributors/combiners.
UHF channels range from 21 to 68, you may have to change your Sky box RF out channel to one that does not interfere with a terrestrial channel.
Here endeth the lesson.