Yes. because some day we may have to fight where people have effective jammer equipment.
I have wondered what a large spark gap transmitter would do to the data link to a drone. Its brutally low tech but it hits almost all bands and is well dirt cheap to build.
Not much. I won't go into details, but really, not much. I've got an arcing insulator out on the street near me (that the electric company won't change, 20db over S9), and I have electronics to get around that listening to faint morse code from South Africa. And my gear is commercial crap.
/johnny
Generally digital signals are broad band and redundant. The spark gap hits all bands, but not all bands at once. Noise would affect a few 10s of bits per seconds, but if you are sending out 10,000 bits a second, and you have cyclic redundancy checks to both detect and correct any errors, you mostly can ignore the jammer.
If they put 10,000 spark jammers out there, they would be likely to hit the same bits multiple times, rather than just hit the ones they missed. Further, a jammer is a beacon. If you broadcast vs. the US, you may have a loud noise coming your way.