Some experiments demonstrates that the buried metal can produces negative or positive charges. If the environment is positive in a particular day, the metal becomes negative. If negative, the metal acquires positive charge. This is the "reason" why is important to detect the rapid variation in the site of the buried metal, positive or negative, and as the article refers (translate in English by Qiaozhi in this thread, read it!!!), Zahori detects the most minimum umbalance of charges, positive or negative. The article also refers that is possible to detect various kinds of fields, not only the AC fields, in theory also radiactivity. Buried metal for long time contain a quantity of energy. The oscillator based on the 555 justly despolarize the antenna in the supossed case it acquires nocive charges for the detection.
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