The method may include sensing at least one of a current and voltage of an antenna coil and adjusting a variable capacitive element of a resonant circuit tuning system to vary {HEAD ~ a resonant impedance} of {TAIL ~ the coil} based on the sensing 
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The method may include sensing at least one of a current and voltage of an antenna coil and adjusting a variable capacitive element of a resonant circuit tuning system to vary { HEAD ~ a resonant impedance } of { TAIL ~ the coil } based on the sensing
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH