A capacitor is ion seperation. The way a tuned loop works is the energy is captured by the coil and a charge builds up on one side of the capacitor. Then since the other side of the cap has an imbalance the charge flows back through the coil to the other side of the capacitor and if it's tuned it will continue to resonate as the capacitor acts like a spring. I would think it shouldn't really matter which polarity of ions you are measuring because both are present.
The whole point of this discussion is that the human body can act like a tuned antenna. The body has some capacitance, and if you hold your arms out there is going to be a slight amount of energy that flows through the air from one hand to the other. So if you think of your hands as the vanes on a capacitor, the ions are right there. Comprende?
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