In Dartmouth, local college staff have figured out how to budget and effectively improve the quality of wireless signal transmission. The solution was based on foil. This reflective material is mounted on an antenna printed on a 3D printer. The shape of the antenna is calculated based on the parameters of the room. Also takes into account the placement of the device for receiving and transmitting data. Researchers tested different types of directional antennas. In addition to them, they took for testing a metal can from soda. So they managed to identify the optimal shape for the passive reflector, which best covers Wi-Fi communication room of any configuration. To obtain a suitable form used three-dimensional printing and the author’s program WiPrint. Next, the surface of the reflector was covered with foil. A pleasant bonus was a high degree of connection security. Such “caps” made of foil allow you to create a virtual space. Inside it, the signal is strong, but invading from outside is not so simple. The program is not yet available to the general public. It is curious that the development was presented two years ago, but journalists drew attention to it only now.