I've heard of a few low-fers that have done higher power experiments, with longer than 50ft antennas, in the license-free 1750M Experimenter's Band, 170kHz - 190kHz, And, I've even done Carrier-Current there, where 10mW will carry a long way on the power lines, with those NBFM Intercoms, but in North America the LW band seems pretty pirate-free. Probably, since no one believes that there's be an audience down there.