For the best 4G signal, the Connect 4G Adapter should be placed in an area of your house with good cellular reception such as in a room with a window. It should ideally be located as close as possible to a window. Suction cups may be used to mount the adapter directly against a window. The adapter should not be placed in a corner, against a wall, or within five feet of a large metal object like a water heater or refrigerator.