Wiring up house .....
First, an apology. Above, I said using a "splitter in reverse" might cause some problems, due to dc volts for "eye link" going through it. Complete rubbish, so just ignore, in fact there's no problem doing this (I was only half awake yesterday!).
dc volts does come out of sky box "rf2 out", but not from "tv aerial in", to which the "reverse splitter" would be connected! So, I repeat, there's no problem.
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When wiring up house, use satellite grade cable, because this has a continuous outer conductor - instead of just open braiding - and therefore is much more resistant to any outside radio interference (should there be any!) on long cable runs. The cheapest type is rgu6, sold by Wickes and other DIY stores as "satellite cable", that's ok. Or, you can order various sorts over internet, eg
www.cpc.co.uk . Or buy at a specialist shop, if there's one nearby.
To remote control non-sky devices remotely, you need to add a "link plus". This is a tiny box that "inserts" into the tv cable going into SKy box rf2 socket, and 2 infra red transmitters plug into it, then you just put these close to the ir sensors to the devices you want to control, and can use the original handset form anywhere else in house (where there's already an eye link).
See:
www.satcure.co.uk/tech/tvlink_plus.htm .
(You'd be using a T180 or SLX8b amplifier - not a "loftbox" with only 4 outputs - but it connects up the same).
Then, you need to tune the idtv modulator output, sky box ouput, (video recorder?) output, to different "spare" UHF tv channels, so you can select them from anywhere in house, on a connected "ordinary" tv set. This might take a bit of trial and error, ie, some channels might interfere with each other, or existing analogue or digital broadcast channels, but there's about 50 UHF channels total, so you certainly should be able to find enough "reusable" ones for just 3 or 4 devices!
Note that, all this should work without too much trouble, but (obviously!) I can't guarantee you won't get any problems. But, it should be ok, and you won't know until you try!
There are always possible problems, external interference etc, to which there are solutions (in-line filters, etc), but don't worry about this in advance, it's unlikely, and solutions do exist.
For a different "professional planning" approach to in house tv distribution, see:
www.wrightsaerials.tv/Resources/Domestic%20Multi-Channel%20TV.pdf .
1 or 2 things ......
A reminder, this doesn't distribute stereo tv sound, just mono! If that matters, consider instead using video senders.
If getting the SLX8b amp, make sure it has got a "b" on the end (for "bypass"), since the "standard" SLX8 (no "b"!) won't "pass back" the eye link signals!
If you get all bits you want from cpc (above), they courrier deliver, and postage is free if total order is above £50.
(Crikey, it seems my member's profile just got upgraded to "specialist contributor", although it doesn't say what in, which is probably just as well .....!).