A method, device, computer-readable storage medium, and system for determining key performance indicators of a wireless RF signal received by an antenna from a signal source. A diagnostic device may receive signal of a carrier network from a primary antenna. The diagnostic device may transmit the signal to a mobile device that is registered on the carrier network. A mobile device may receive the signal from the diagnostic device, demodulate the signal, and determine key performance indicators of the signal. The key performance indicators may be displayed in real-time. This allows a technician to orient the primary antenna so that it receives a signal from the signal source with the highest quality key performance indicators it can receive.