The idea is simple. A wireless replacement for the cable from the socket outlet to the TV should have come years ago. I think however you can make some prototype with two Raspberry Pi’s or maybe one raspberry pi and a Chromecast. The Raspberry Pi is placed at the socket outlet. You need a TV-card with cable input and a wireless dongle connected to it. The idea is then that you select the channel from the phone or tablet and let the Raspberry Pi stream the single channel to the TV. The video should be streamed with lossy compression for the sake of the bandwidth. The quality could suffer a little bit but I think the loss of trouble with cables is worth it. I mean you can place the TV where you want it to be.