It depends upon your wireless modem/WiFi signal and the obstructions and type of construction between the WiFi modem and the camera. I've installed a few WiFi repeaters to increase the range. You should have no problem in the "average" 2000 Sq Ft home, depending upon c construction, upstairs v downstairs etc. These issues are easily resolved with the WiFi repeaters.
As to CONCRETE, depends on how thick etc. BestBuy and Amazon have a no questions asked return policy so you can't go wrong.