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>Rydberg antenna range: 0-20Ghz, https://www.hackerneue.com/item?id=28402527 https://en.wikipedia.org/wiki/Rydberg_atom

Actually the instantaneous bandwidth of a ryberg antenna based receiver is only about ~4 MHz in implementation papers I've read. A good fit for a 2 MHz instantaneous banwidth $20 rtl-sdr dongle. The 0-20 GHz is the tuning range (again).