re: Cellphone boosters

T-mobile gave me one when I called about poor service at our lake house. You put an antenna in an area of the house that has signal. There is another device on the other side of the house that the antenna beams the signal to and that acts like a mini cell tower. Because you don't want the antenna getting the signal from the booster the booster dials back the broadcast of the signal until it doesn't reach the antenna so it's best to have them on opposite sides of the house for maximum coverage. Works great.