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.
Signal Read
Source Trail
Daily scan: 2026-07-11
- No public source URL captured yet.