Antenna-based radio detection systems and methods

An antenna-based radio detection system, comprising: at least one transmitter antenna arranged at a first location and configured to emit electromagnetic (EM) radiation into free space toward a scene to generate electromagnetic radiation reflections reflected by at least one object in the scene; and at least one receiver antenna arranged at a second location spatially separated from the first location and configured to generate, based on the electromagnetic radiation reflections received at the receiver antenna from the scene, reflection-based signals. System further comprises an electromagnetic radiation (EMR) absorbing structure formed by a plurality of EMR absorbing elements which are disposed between the first and the second location.