With the sky hd+ boxes you can use coax cable to connect from the 2 RF out on the back of the box to the TV's that for me was great as the picture quality was decent.

With a wireless sender receiver connection there's to much interference and a weak signal if the area is to big and obstacle in between.

I searched for scart to rf convertor on Ebay and found a few items that may be the job but they only have one RF and I would require 2 RF out.