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No antenna restrictions, 1.8 mW into a 1/2 wave dipole, enough bandwidth to do AM on 13.560 mhz… Sounds like a cool place to experiment!
This does not appear to be the case. According to the FCC rules:
Section 15.225 Operation within the band 13.110 – 14.010 MHz.
(a) The field strength of any emissions within the band 13.553-13.567 MHz shall not exceed
15,848 microvolts/meter at 30 meters.
and so on for the frequencies involved. There is no mention that I could find in the rules of antenna or power alternatives to the field strength limit. The power and antenna would have to be adjusted together to produce a field strength meeting the limit. Any antenna and any power would be legal as long as the field strength limit is observed and perhaps the numbers you cited would achieve this, or perhaps not.