Negotiate the problem:
Maybe is very difficult to demonstrate the ionic detection. But I'm SURE the detection occurs via difference of micro or milivolts between the antenna and the long time buried conductive metal. This long time buried conductive metal affects the soil and changes his natural potential, but advise all you this:atmospheric presure and humidity causes influences. When atmospheric presure is more low, detection is better. My only problem is this: how I can do for to shield of high hot temperature here!!! This causes deviation in the semiconductor and can't adjust properly the microvoltmeter (not the same microvoltmeter on workbench than microvoltmeter outdoor). The only way I found (myself, I don't know if others discover the same) is encapsulate the semiconductor in oil. I make some experiments and is very effective as hot protection. Another important problem is the vecinity of electric power lines.
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