If this is okay, I plan to run a cable from the aerial out on my sky digibox up to the wall to the loft. Then using a 3 way junction box, run a separate feed into each of the kids bedrooms so that they can watch the kiddies programmes upstairs. They already have a normal terrestial feed in their rooms from this junction box. However could I combine the feed from the roof aerial with the feed from the sky box so that there is just one cable that will have the signals for their normal tv channels and also the channel from sky, I think I have that set at 42? That way I can the existing sockets that are already in their rooms and just connect everything up in the loft. They can then watch BBC1 through to CH5 as normal and I would tune channel 6 into sky 42? If so what do you call this device that combines 2 feeds into 1 without losing too much quality? I know there is such a device fitted as I have 2 aerials on the roof, one for each of the 2 tv transmitters in the area and the tv bloke who installed it, fed the 2 feeds into 1 cable up on the roof. However I don't fancy climbing on my roof to find out!!! Many thanks in advance?