I have a standard Sky Wifi router in my living room, which works great throughout the house but for some reason is really struggling when I try to use my iPad from my garage. The garage is directly behind my house about 25 feet away, and the router is up against the window with line of sight to the garage, but even so it's really crummy reception (the garage door is open). I am wondering if the double-glazed window could be the problem and if I just need a WiFi repeater or something on the other side of the window. But I'm not sure what I am looking for... I don't really want a repeater which picks up the signal and re-broadcasts it, but a cable from the router to an outside device. It only needs to be a few feet long. Does something like this exist - maybe it plugs into an ethernet port - and what would it be called?