powerline kits are good for just such an occasion. of course, running a legitimate ethernet cable will be better, but a powerline kit is easily better than wifi.
on the tv dongles, DScaler is quite a good decoder for tv cards/usb tuners, but its a bit of a pain to set up. windows media center used to be excellent for tv broadcasts. quality was good, and the interface was exceptional, but whether you have this is entirely down to what operating system you have (windows 8 doesnt include it in home premium versions, neither do most windows xp installations). another application may be xbmc, but i havent tried this myself so cant really say on that one.
otherwise, for live tv the iplayer is quite good (when it doesnt buffer), but, once again, i cant comment on the others. personally not sure if they have live at all but cant be sure.