While generally called antennas, they aren't employed as radio antennae for obtaining or broadcasting radio waves, but alternatively act as plates of capacitors. The distance from one antenna decides frequency (pitch), and the gap from the other controls amplitude (quantity). Increased notes are played by transferring the hand nearer on https://drum-handling70171.rimmablog.com/37243600/mezzanine-safety-gates-uk-fundamentals-explained