CACI International has filed a patent application for monitoring the contents of sealed shipping containers using ultra wideband (UWB) techniques. This marks the first time robust and reliable data signals have successfully been transmitted from inside a sealed container without modifying the container. CACI anticipates employing its application for a wide range of uses, from supporting the movement of military supplies to assuring the security of assets entering the United States. CACI developed the new monitoring methodology in cooperation with Advanced Resources Corporation (ARC) of Culpeper, Virginia, and Multispectral Solutions, Inc. (MSSI) of Germantown, Maryland. A wireless UWB transmitter is placed inside a container at the time it is sealed.