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it's the international telecommunications union telling anyone who cares to read that ground wave communications are possible @ 30 mhz. out to 150 kM. over medium dry ground and out to 360 kM over sea water with average salinity, not me.


they made the decision to run the tests with both the (vertical) transmitting and receiving antennas at ground level, not me.


i have worked 11M AM mobile stations from across the desert via ground wave out to distances of 177 kM. with signal to spare. that's not anecdotal evidence, it's a fact.


if you think that this path distance at this frequency was not supported by ground wave propagation then feel free to let me know which of the other three basic propagation modes were responsible for this and why.


free space propagation:

ionospheric propagation:

tropospheric propagation: