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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.
Often a Sensors & Software 1000 MHz GPR unit is used to scan concrete for rebar, cables, pipe, and post tension cables. The higher frequency antenna provides greater detail. However, you indicated that you want to reach depths of penetration up to 27 inches.