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Ground-penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. This nondestructive method uses electromagnetic radiation in the microwave band (UHF / VHF frequencies) of the radio spectrum, and detects the reflected signals from subsurface structures.
Dowsing Versus Technology. Modern technology has brought us Ground Penetrating Radar (GPR) or, as some call it, Ground Imaging, which is a machine that can be rolled along the ground and can show images of possible unmarked graves, headstones and burial vaults.