Normally, a wireless security camera's range is advertised to be up to 500 ft. or more if it’s placed outside of the house and 150 ft. if it’s placed inside. But most of the cameras don’t deliver it’s promised. So, it’s not a wise thing to put your security camera too far away from the router.  Moreover, obstacles like walls, steel furniture weaken wifi signals. So, always try to place your security cameras within a 100-150 ft. radius of your wifi router.