I've been meaning to work on figuring out reticulum on 7mhz ISM.

The big win would be NVIS type coverage, kinda like 40m js8 without a #hamradio license. Massive range with a single transmitter, hundreds of miles to global with the right atmospheric conditions.

The big downsides would be antenna size compared to 900mhz ISM like #meshtastic and much more coverage variability over the course of a day and day to day.