DRT 4411B

Survey Equipment

“Monitor a huge political protest”

Review by Jennifer Lynch

Senior Staff Attorney, Electronic Frontier Foundation

Are you trying to monitor a huge political protest? Look no further than DRT. Nicknamed “dirt boxes,” these devices can locate up to 10,000 targets and can process multiple analog and digital wireless devices all at the same time. They’re even capable of intercepting and recording digital voice data. The best thing about the devices is the fact that no one may ever know you’ve used one. Just be careful — if your targets do figure out you’ve used a DRT box, and you haven’t gotten a warrant, they may be able to convince a judge to throw out all the evidence you’ve collected on them after you used the device.


The DRT 4411B is a miniature receiving system that provides powerful electronic surveillance capability against a variety of analog and digital wireless standards. Utilizing the latest in digital signal processing (DSP) and micro-processor technology.

Limitations and Planning Factors

- RESTRICTED SYSTEM - Small size and light weight and quiet - Low noise signature - Low power requirement


Digital Receiver Technologies
Germantown, Maryland-based DRT produces communications test and measurement equipment. It is a subsidiary of Boeing Integrated Defense Systems. Known by the nickname “dirt boxes,” DRT devices are cell-site simulators used for land-based or airborne capture of cellphone data. — Margot Williams, The Intercept


2 MHz - 3 GHz


Title 10/ 50

Cost: $40K

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