It is well known that millimeter-wave technology provides an important imaging capability through clothing and adverse weather conditions, among others. Alfa Imaging has undertaken a project to study the different applications of mm-wave imaging. An important part of this project is the measurement of material properties of a number of clothing and packaging samples in the frequency range from 40 to 306GHz. This task has been undertaken by the Antenna Group at the Public University of Navarra using an ABmm Network Analyser. The resulting data has been analysed and is presented in this paper along with example images and conclusions on the ideal operating frequency for the various applications studied.© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.