QuadRF can spot drones and see WiFi through my wall

QuadRF is an open-source phased-array radio built around a Raspberry Pi 5 that can detect WiFi signals through walls and track drones in flight by performing advanced signal processing and beamforming. Developed as part of a larger Moon-scale antenna array project, the handheld device operates in the 4.9-6 GHz frequency range and costs $499 for a basic kit, though its user interface is still being refined. The technology demonstrates capabilities that governments have possessed for years, raising awareness about RF signal vulnerabilities and security practices.