Stealth Wallpaper

A type of wallpaper that prevents Wi-Fi signals escaping from a building without blocking mobile phone signals has been developed by British defence contractor, BAE Systems. The company has based its solution on the secret "stealth" technology that it uses to hide military radars. The covering, called Frequency Selective Surface (FSS) sheeting, is used to shroud radar antennas on warships or aircraft. The technology is designed to stop outsiders gaining access to a secure network by using Wi-Fi networks casually set up by workers at the office.