And the creator of dump1090! When I was a student receiving Mode-S transponder was so expensive, we had a shared receiver/decoder for the whole eng. school. Now that I lecture there I show the students a $6 RTL-SDR with dump1090 to show how far open tech goes, plus some MATLAB code to store/plot the aircraft data: https://github.com/JorgeGT/PlotRTL1090