@nelson
The frequency depends on the Hertz of the nearby higher voltage AC-current and is audible in the whole spectrum for human ears.
If there is no strong AC voltage field, it has only switch on or off.
To make this device much more sensitive I'll try to find a way to inject some threshold power into the antenna (FET Gate) so it just would take a very small plus of energy to make the FET switch on (or even off, if kept in balance between on or off).
@ goldfinder
Yes, the ion patterns will be the next big project, but still I think even with electrostatic you can detect metallic distortions in the EM-field because I tested this already with that silver ring. In this case was the metal between strong current field and static-detector; but the natural field has some special current - so the detection is more difficult, and especially variable by the ground conditions.
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