Brighter minds than mine, etc....
Posit two scenarios. The bad guys are using aviation frequencies and their locations can be determined.
They use hobby frequencies and whatever may be affected would be momentary and inconsequential to legitimate users. Radio control models will just be unable to operate within x miles of airports, and surveillance cameras can be set up near all the likely places the bad guy would pick to do the deed.
“Why aren’t all the possible frequencies these minidrones can operate on determined, and 2-second bursts of ‘control’ commands transmitted at intervals to freak out the drones?”
Drone countermeasures, especially against hobby-type RC drone aircraft are probably employed near aircraft used by VIPS and the military. There is no sign that these types of protection are in use at civilian airports, which are a big soft target for terrorists.
The latest drones use GPS-guided autonomous navigation which uses NO radio control. All GPS units in cars would be disabled near airports if GPS were jammed.
Here is a basic description of new inexpensive navigation available to you and to terrorists now which could be used to "mine" the runway kill zone or landing approach kill zone:
http://diydrones.com/profiles/blogs/ardupilot-mega-home-page
"Just add the ArduPilot Mega autopilot to any RC aircraft and it becomes a fully-programmable flying robot with a powerful ground station and Mission Planner. Features include: ■Return to Launch with a flick of your RC toggle switch or a mouse click in the graphical Ground Station ■Unlimited 3D GPS waypoints ■Built-in camera control ■Fully-scriptable missions ■One-click software load, and easy point-and-click configuration in the powerful Mission Planner. NO programming required! ■Replay recorded missions and analyze all the data with a graphing interface ■Supports two-way telemetry with Xbee wireless modules. ■Point-and-click waypoint entry or real-time mission commands while the UAV is in the air ■Fly with a joystick or gamepad via your PC--no need for RC control! ■Built-in failsafe will bring your aircraft home in the case of radio loss"