2x Tenda PH3 Gigabit powerline adapters.They are ethernet cable connected i.e. they donot have a Wi-Fi Hotspot function. Rated at 1000AV (Gigabit). Then take the other adapter to the room you require, plug it into a wall socket (not extension lead) and connect it to the LAN socket of the device (Smart TV, TV box, PC, console etc) using another ethernet cable.
eBay