Although commonly referred to as antennas, they're not applied as radio antennae for obtaining or broadcasting radio waves, but somewhat act as plates of capacitors. The gap from one particular antenna decides frequency (pitch), and the distance from the other controls amplitude (quantity). Better notes are performed by going the https://jaidenfbqdo.blogocial.com/the-smart-trick-of-pallet-gates-uk-that-nobody-is-discussing-74218606