How so? A guitar doesn't go past a few kHz (the highest string is IIRC 660 Hz, and the top fret is 660*4) and AM long wave radio—which is almost dead—starts aro

How so? A guitar doesn't go past a few kHz (the highest string is IIRC 660 Hz, and the top fret is 660*4) and AM long wave radio—which is almost dead—starts around 120 kHz.