Hi Zocky-Zocky!
Thx for your interrest but for now I have no idea how to improve this stuff. The EMFAD detector uses passive long wave receiver that can find EM-field concentration but what we'd need is to get the "reflection field" of metal objects inbetween the underground electrostatic field.
Modern earthquake-warners can detect the current of bedrock if set under friction or pressure like it is used in piezo-lighters but yet I have no idea how to use this for metal detection.
Answers to your questions:
1. don't know but these values are not important in this case
2. 0,25 or 0,30 mm
3. no idea
4. ca. 25x15cm
5. iron tin, but you can use anything
6. if there's written no k the ohm values are below 1000
7. the activ-speaker has an amplification, but not alot
btw. if you're using a larger plate antenna you can get even more sensitivity. Good luck with your experiments!
