Another potentially useful anti-drone device would be an old-fashioned, early 20th century spark-gap transmitter/antenna...the drones are probably designed to hover and circle if they lose contact with the controller. So, they eventually run out of gas/electricity, and drop out of the sky. It is important to recover it reasonably intact, because there are valuable goodies on/in it...for example, the particular drone in this article probably had a GoPro camera, which is very nice (a few hundred bucks at least) and could be “re-purposed”.
Rotary gap transmitters have been illegal since the 1930’s.
That dancing blue spark which enabled the doomed Titanic’s wireless op to send the very first S.O.S. will interfere with absolutely any electronic device built since say, 1925.
What it would do to today’s digitized remote controllers is anybody’s guess.