The quality of your Wi-Fi also depends on any obstacles between your device and the b-box, Internet Box or Wi-Fi Booster because the Wi-Fi signal moves in a straight line. Anything which cuts your device off from the b-box, Internet Box or Wi-Fi Booster will weaken the signal, including things such as concrete, metal, brick or simply insulated walls. The Wi-Fi signal can also be weakened by furniture such as mirrors, shelves, wardrobes, etc.