Abstract Remotely monitoring the location and enduring presence of valuable items in adversary-controlled environments presents significant challenges. In this article. we demonstrate a monitoring approach that leverages the gigahertz radio-wave scattering and absorption of a room and its contents. including a set of mirrors with random orientations placed inside. https://www.roneverhart.com/5-15P-ANGLE-PLUG-B-W-HUBBELL-HBL5266CA/