The raspberry Pi has a Wireless module that you can attach to it, through the Pi's USB port. The wireless chip is only like $4-9 in price. After attaching the wireless module, you can connect the Pi to your TV through HDMI/Video Out (the Pi has two vide output options). Assuming your computer is in a different room, you can connect to it directly and stream Video content to your TV. I also think there's some specialized software that will help you stream videos out of the box.. Cheers!