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That is a very interesting item, Artisan Radio, and I have some information to add to yours.
The FCC rule 15.255 was updated at some point to allow more power at 13.560mHz.
15.225 (a) The field strength of any emission within the band 13.553-13.567mHz shall not exceed 15,848 microvolts/meter at 30 meters.
In connection with our Big Talker shortwave transmitter builder’s project member PhilB was kind enough to calculate some antenna and power level projections, linked here