I still think a net launcher would be a cool countermeasure.

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Dronebuster will let you point and shoot command hacks at pesky drones
Not exactly a jammer, the "gun" exploits library of drone control protocols.
by Sean Gallagher - May 19, 2016
http://arstechnica.com/information-technology/2016/05/dronebuster-will-let-you-point-and-shoot-command-hacks-at-pesky-drones/
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EXCERPT:
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...A version of the Dronebuster is already in the hands of some federal government customers. That device uses broadband jamming like the DroneDefender. It has the advantage of being much smaller than the DroneDefender, and it can be aimed using optical sights or an integrated radio frequency power meter and signal analyzer. Someone trained on the device can even distinguish what kind of signal is being emitted from the drone—telemetry (such as remote video streaming) or control. Still, its jamming technology makes it illegal to use in the US.

But a new version being developed by Flex Force operates completely within FCC regulations, though depending on what kind of drone is targeted, the new device may require an FCC license. Instead of jamming C&C signals, the new Dronebuster exploits weaknesses in the drone communications protocols themselves, enabling the Dronebuster's operator to trigger the "fly home" command on some drones and the "land" command on others. It does so by cycling through command sets for various drone systems....
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