If it's the infrared remote you want to extend I used one of these awhile back for a friend:-
link
There was a flat screen TV, wall mounted, with no shelving around it, so a cupboard was installed in the loft above the TV to house a BT YouView Box, an Apple TV Box and a Humax Video Player.
There was a HDMI Switch, so the infrared extender controlled the HDMI Switcher to select the output required.
It all worked well (to my surprise, because it only cost about a fiver at the time!) the only downside was the number of remote controls there was!
There was only a small infrared receiver stuck onto the TV and was hardly visible.