Stop Mocking Me0

Ok, I need some help with picking a way to improve my internet connection to my xbox one. Recently I've put the box in the same location as the 360 and the wii. Ever sense it's been super slow with a .90 mbps download and .75mbps upload speed. It's connected wirelessly to a router upstairs with 2 walls and 1 floor in the way. I am wondering if I should get a repeater to put between the xboxes and the router, or should I find other means, please help.