Sure it's not possible to jam the signal to and from drones?
The sun can corrupt a signal between a sattelite and a disc on the ground, if they're in a straight line (something experiences for a short while at noon every year up north where the sattelites are "low on the horizon")
So with the right equipment to detect the drones, disrupting the signal should be possible as well.... question is, who gets there first? And then you'd need someone on board again...
And I honestly don't believe jamming and corrupting encrypted radio signals cannot be done... Finding the frequencies may be a bit harder, but that kind of equipment have existed for years as well, mostly for intercepting radio communication though.
Radio frequence interference is already making using GNSS in some parts of the world "harder"...