Interesting thought, just hook up an antenna in the phone to resonate at say 98 megs.....middle of the FM radio band, which is between Ch 6 and Ch 7 in the TV bands not including UHF of course....but still plenty of RF power out there to keep some charging action going on all the time.....
coil of wire, a capacitor, and a diode......interesting concept.....
maybe even the AM radio freq's .....530-1600 khz, but more windings on the 'antenna of course.....
