Ok, depending on what sound/picture quality you are after, this can be done, but don't expect the impossible, wireless technology isn't that great for transporting video/audio unless you use broadcast equipment, but then you would fry your brains after 10 minutes.

There is a gizmo out there (several in fact), that plug in the back of your sky/dvd/vcr, and wirelessly transmit video and stereo audio to another in the house, which is in turn plugged into a bedroom tv for example.

I think they are called video senders, I guess the cost would be around £50-£100. That would take care of the TV out + Sound from your PC to your TV, but be aware that TV resolution is much lower than a standard PC so you won't be able to see very clearly on the TV, forget browsing the web, emails, etc.. only really best used to watch mpeg/divx, or, maybe just about enough to play/manage MP3s.

I hope this helps
Greg