QuadRF can spot drones and see WiFi through my wall

This article reviews the QuadRF, a phased-array radio system built on a Raspberry Pi 5 and FPGA board with picosecond-level timing. It can detect drones in flight and visualize WiFi signals through walls using advanced beamforming and signal processing. The device runs open-source software including GNU Radio and an AR RF visualizer, accessible via a browser-based VNC session. The author tests a prototype with his father, noting rough UI but impressive functionality. The project is part of a larger Moon-scale antenna array for EME experiments. The article discusses implications for security and RF experimentation, emphasizing awareness over fear.