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This little crap #lorawan beacon with 3 cm antenna and powered by a single 18650 cell was heard from Pen-y-Fan peaks (next to the green "B...n" icon in the middle, stands for Brecon) at the coast of Irish Sea (far to the left).
After checking on a map I got... distance of 80 km! 😮
For reference, this was SF12BW125 so the slowest LoRaWAN rate where ~50 bytes took 1.4 sec to transmit, but this apparently gives pretty impressive distance.
I'm not a radio guy, so discovery of how spread-spectrum (DSSS) and frequency-hopping (FHSS) work, literally below the radio noise levels was one of the "wow" moments a few years ago, when you literally discover a technology that is so clever that before you dig into it basically is close to magic.
How GPS navigation works was another one of these "wow" technologies and I strongly recommend reading/watching how it *actually* works, as it contains an impressive amount of human ingenuity.