Four coherent dual-polarisation antennas on one tile, bolted to a Raspberry Pi 5, and the result is a 4.9-6.0 GHz C-band radio camera that shows you where routers, cameras and drones are really transmitting — live, at 30 frames per second, as a colour map over the room. Because it is coherent and full-duplex you can also tap a signal, hand it to GNU Radio or transmit a reply, and the tiles chain together: stack them and the same hardware becomes a 240-antenna phased array for radio astronomy or moon-bounce. Open source, FPGA-backed, and the sort of instrument that used to require a laboratory.
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