Frequency generator with L-rods. Can you use L-rods? Most people never learn. You can build you own with a cheap signal generator and two pieces of bent welding rod.
Molecular Frequency Discrimination (MFD) ROD with Frequency Generation system works good up to 500m and more , but here important is using Frequency for search .
All human use 5000 Hz ,this not is very good .
Some model from this Rod system some time can find also gold mineralization , so this not is good for searcher .
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