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I've been playing around with software defined radio stuff lately. I feel like such at hacker! I managed to listen in to my local PD's radio comms, which frequency hop and are digitally encoded (It's trunked P25). I did all this with a $20 USB dongle and free software. A police scanner that decodes this kind of radio traffic costs $500+. Next on my list of things to try is mapping aircraft in real time by listening to their ADS-B that they broadcast while flying.