Currently, in my parents house, we have an Airport Extreme connected to the Sky router (Since they mandate that you have to use their router or else!). With the Airport Extreme, there's fluctuating signal upstairs. The Extreme is in the hallway at the bottom of the stairs (Close to the sky router, there's not really anywhere else it can go). I have a spare Airport Express I was thinking about taking over and using that to improve the signal upstairs, but not 100% sure on the best way to go about it. My 2 thoughts are: 1. Use the Express to extend via wifi on the landing at the top of the stairs, I believe it can wirelessly connect to the Extreme with no other assistance? 2. Get a power line ethernet plug, then plug the Express into the other one upstairs. Which is the best option, or is there a better alternative?