You think that the phenomenon of long range detecting is a derivation of the normal metal detecting but it is not, do not apply the laws of classical electromagnetism, an LRL reveals a side effect of a metal buried for a long time and not the metal itself. The fact that this phenomenon is so difficult to measure directly makes me think that in some way are involved Terahertz frequencies that are very close to the range of infrared and therefore such an infrared photography can highlight something different over a buried metal long compared to the surrounding environment.
Regards
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