https://www.rtl-sdr.com/tag/vlf/
a fair number of examples -
As I speculated, the 8 bit RTL-SDR has a problem with strong broadcast
band AM, so you need some sort of LPF.
There are some examples of "amplified whip into sound card into Rpi"
implementations.
I didn't see anybody actually decoding or measuring the phase though -
lots of waterfall plots showing the existence of a signal.
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