This is a similar technique that brought the US down a while back, on different frequencies (jaming GPS, ~1.5ghz).
Unfortunately, this does not work when the drone does not require such information (be it GPS or remote signal). Newer drones, both military and consumer grade use vision sensors and can even recognize preloaded maps by looking at the ground.
Now, maybe ISIS does not yet have easy access to this tech (though anyone in the silicon valley does, or any decently good engineer really), and read-to-fly consumer drones such as the phantom 4 (1000usd+-) already has vision sensor for flight, avoidance and tracking (but not mapping and path detection - yet.. though you can jailbreak them, its running android - and add your code)
If you think about it though, vision is just another set of frequency and there are ways to jam them that are still efficient. I'm guessing in the future there will be a combination of "anti drone" guns:
1) radar detect and destroy (missile, gatlin gun, high powered laser, all these work and high powered laser might be best). Today's radars recognize them no problem when they get in range to "drop a bomb". They would have to be as fast as missiles or faster to be a threat, even with stealth technology (though none has stealth). This is however expensive.
2) Low power laser. a 1w laser pointed at the camera sensor will damage the sensor, rendering it inoperable fairly quickly.
3) high power light beam. Same but does not damage the sensor. this includes high power IR beam for night operations.
and of course: nets, shotguns, etc. or a combination of GPS, remote control jamming + other things.
ps: theres a better, reliable way to achieve all this, its called a mortar. Cheap, accurate, and only a very expensive system can destroy the payload in flight (ie solution 1), and its not even 100% reliable. Or you know, just suicidal humans (which they have used several times now.... I bet its cheaper and easier for them than buying a phantom4 anyway).
Anyhow, an interesting topic, and I do hope it doesn't come to any of this.