What Is A Signal Booster? It can be a wi-fi or a cell phone signal booster. It is also known as an amplifier or a repeater. It is a device that has an amplifier and minimum of two antennas (exterior and interior). All items connect with coax cable(s). It boosts wi-fi and/or cellphone signals to your wireless device. It can improve Wifi & cellular in homes, offices. Wireless communication occurs over a wide spectrum. Our wireless network boosting products cover mobile, Wi-Fi & TV freq. bands used in India & Mumbai.