Ground penetrating radar (GPR) is a commonly employed geophysical tool, with far-reaching geologic, engineering, hydrologic, and environmental applications. GPR radiates short bursts of radio frequency energy into the ground, ice, water, and man-made materials, to allow non-invasive exploration of features not visible at the surface. Data collected using GPR is important for both scientific research and public safety. This technology, which has been used for nearly 30 years, is now threatened by a recent Federal Communications Commission (FCC) ruling to regulate the operation of ultra-wideband devices, including GPR. The FCC ruling will take effect on 15 July 2002.