I liked #11:
> Using the decoder rtl_433, I saw two sensors that output the current temperature, humidity, and air pressure!
> There were also some “IBIS beacons” flying by, which are used in public transportation, so maybe it’s buses driving by? [This gets followed up on in #41.]
Would also add a recommendation of receiving GNSS signals, though I don't remember whether a special amplifier was essential. With your own transmitter (using a freely usable frequency to not bother real users with the much-too-strong signal) it worked great
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