Above diagram illustrates how a repeater extends signal coverage to every corner of the building. The exterior yagi donor antenna placed outside of the building where it has easy access to a BTS. Signals from the donor BTS are then introduced into the repeater. After amplification by the repeater, signals are divided into several parts by splitters or couplers and sent to the interior service antennas. The service antennas are placed inside the building where it can extend radio coverage to the dead zones. Therefore, the subscribers have seamless access to mobile signal from every corner of the building. Through a high-tech, reliable repeater made by Etenda and the applicable system design, the QoS for applications like voice call, video call, video streaming, and data services will be guaranteed to each customer.