Complete GPR system for Concrete Inspection. The StructureScan Mini XT is GSSI's newest generation of our very popular all-in-one ground penetrating radar systems. The StructureScan Mini XT offers a 2.7 GHz antenna for superior target resolution and can reach depths up to 60.96 cm (24 in). This system is designed with the option for users to add accessories and tailor the unit to specific applications. With multiple modes of operation, the StructureScan Mini XT is ideal for locating rebar, conduits, post-tension cables, voids and real-time determination of concrete slab thickness.