Electromagnetic Warfare Is Here – IEEE Spectrum.
Far more uses/dangers for this in the non-military world as well (bring down security systems or just bring down the system which can be used as a diversion for other miscreant actions). As I introduce in WiFi networking (coming in week 8), it is also possible to interrupt communications between router and hosts causing them to re-login at which point you can set up an evil twin, become an intermediary and capture all communications.