2026-07-11 / Signal #5

QuadRF, demoed by Jeff Geerling, spots drones and sees WiFi/signals through walls.

“Your walls are still opaque to your eyes. They are getting much less opaque to a Raspberry Pi with ambition.”

Why It Matters

Surveillance capability becomes hobbyist hardware. Walls stop being social boundaries when RF tools make hidden signals visible, and drone detection shifts from military/institutional gear toward weekend-builder territory.

Evidence

Jeff Geerling blog post "QuadRF can spot drones and see WiFi through my wall" dated July 10; Hacker News top discussion with creator participation; Geerling social/video clips. The device is a phased-array radio around Raspberry Pi 5 plus FPGA hardware, using signal processing and beamforming to map WiFi through walls and track drone signals.

Caveat

Avoid overstating it as literal x-ray vision; it visualizes/locates radio signals and RF activity, not bodies or rooms like a camera.

Sources

Daily scan: 2026-07-11

No public source URL captured yet.