A drone detector for your phone? DeTect, Inc. - DroneWatcher Drone and small UAV detection and Interdiction Systems - drone finder - drone tracker Sounds like the phone app is only good for about 1/4-1/2 mile. Then they sell some DroneWatcherRF that is good for 1-2 miles. A Harrier DSR that is 2+ miles, and some Global Hawk for 14+ nm. Curious as to what ID signature stuff the drones are also sending out which makes them traceable.