You could do the simple scart video senders although the picture won't be amazing even more so if he's used to using a HD box in the other room.
You could get HDMI wireless senders, i've tried them and they aren't too bad with little interference. If you do go down the wireless route make sure it's 5.8ghz and not 2.4, less chance of any interference from wireless devices/microwaves etc..
If wired is an option you could run a long coax lead and if the TV tuner is an analogue one you could tune it through that. Picture won't be great but may do for what he needs. At the end of the coax lead you can use a magic eye (about £5 amazon) to make use of the remote in there.
You could also run HDMI cable to the second TV along with a coax lead and magic eye for the remote to work in there, although HDMI doesn't work well over long distances.
What i have done in one room where i wanted the box out of sight is ran 2x cat6 network leads to the TV and used HDMI adapters at both ends, the run is about 20m but most can do over that if needed. Some of the adapters include the remote sensor to use the remote but i ended up running coax along side with a magic eye as i needed coax for other reasons too.
I think the above makes sense!
