Recently I had a amp/booster fail during a flight. The only way I could bring the drone back down was I had brought extra WIFI antennas with me. While the Phantom was chugging back to home point, I quickly changed to the WIFI screw on antenna. When It got home and was hovering at last way point ,I calmly landed it having signal present due to the emergency antenna. It would have landed anyway at critical battery level wherever it needed to, but I was able to guide it to a safe spot and still have my precious Phantom (New amp on order) to fly another day.