Terrier

Terrier is a vehicle-mounted reactive jammer built by MyDefence , the Danish counter-drone specialist headquartered in Aalborg. Introduced in 2021, the system fills the gap between MyDefence’s body-worn jammers and fixed-site installations: a vehicle-grade RF effector that travels with a convoy or a patrol and can be cued by the company’s broader sensor ecosystem rather than running open-loop. It is built for mounted formations that need drone protection while moving — light tactical vehicles, command posts on the move, logistics columns — environments where a static jammer is no use and a man-portable unit lacks the power and dwell time.

The technical core of Terrier is multi-band RF jamming across the frequencies commonly used by commercial and modified small drones: the 2.4 GHz and 5.8 GHz consumer bands, GNSS, and the lower-band control links typical of FPV and commercial UAS. What distinguishes it from a brute-force barrage jammer is its reactive operation. Rather than radiating continuously, Terrier integrates with MyDefence’s Watchdog passive RF sensor, which detects and classifies a drone’s control or video signal before the jammer is triggered. Only the relevant frequencies are jammed, only when a target is present, which keeps the unit’s electromagnetic footprint and own-force interference low — a serious operational consideration for mounted formations carrying their own radios and electronic warfare kit. The system networks with other MyDefence sensors and effectors through the company’s command software, so a Terrier-equipped vehicle can act as one node in a layered counter-UAS picture rather than a standalone box.

Terrier has been adopted by the United States, the United Kingdom, and Denmark. MyDefence’s broader counter-drone family has been issued to allied forces in Europe and, through donations and aid programmes, has reached Ukrainian units fighting Russian drone activity — the operational laboratory that has driven much of the recent iteration in counter-UAS hardware across the continent. Specific Terrier deployment numbers and contract values are not publicly disclosed, consistent with MyDefence’s preference for keeping operator details quiet.

The product sits in a crowded vehicle-mount counter-drone market alongside offerings from Leonardo, Northrop Grumman, and a growing field of European entrants. What Terrier brings is the tight integration with the rest of the MyDefence stack: the same Watchdog sensor that drives the Pitbull body-worn jammer also drives Terrier, letting a force standardise on one ecosystem from the dismounted soldier up to the vehicle.