You don’t receive the signal, you change the tuning frequency
Antennas need to be set to a target frequency for best performance, and we do this with some inductors and tiny capacitors
The human body is a physically large but low value capacitor. When you touch the antenna you slightly change the frequency it’s tuned to which can improve the reception of the antenna to a specific signal at a specific frequency. Many things with antennas had a knob that was dialed up close by tuning an adjustable capacitor but unfortunately being close means your body is included in the math while setting the frequency so stepping away changes the value and the antenna is no longer tuned correctly
A person would make a terrible transmitter because you’re not an antenna, you’re just not built right
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