ADSBee m1421 - World's smallest dual-band ADS-B receiver module

Show HN: We built the smallest dual-band aircraft tracker

ADSBee m1421 is an ultra-compact, open-source dual-band ADS-B receiver module from Pants for Birds. Weighing under 2 grams and drawing less than 60mW, it fits easily into drones, weather balloons, and other power-constrained devices. It receives both Mode S and UAT signals, including TIS-B and FIS-B, and supports multiple output protocols like GDL90 and MAVLink. Priced at just $48, it's an affordable solution for detect-and-avoid and aircraft tracking applications. The module is available in standard and NDAA-compliant variants, with open-source firmware and schematics.