Both the multi-step and singe -step solutions to UWB inverse scattering problem are first discussed in this chapter. In the former, the CDF-Broyden update using the refined Polak-Rebiere's non -quadratic approximation will be focused. Meanwhile, the enhanced delay and sum (EDAS) algorithm, which uses the coherence factor and multiply in pair will be the principal topic of the later technique. In both cases the dispersive properties of the media are modelled using Debye first-order system, while the conformal mapping is deployed to accurately map curved geometries. The second part of the chapter focuses on an UWB radar data acquisition system, which is specifically developed to assess the performance of these algorithms experimentally. The hardware consists of custom-designed wideband antennas mounted on arrays and connected to a vector network analyser (VNA) via a 16-channel multiplexer switch unit. This set-up allows measurements be performed in the time domain automatically. Both limited-view and full-view geometries are used for measurements.