1. An anomaly sensing system, comprising: a transmitter providing for at least one RF-probe signal and one RF-synchronizing signal at substantially different carrier frequencies and yet synchronous to one another; a coherent receiver having a frequency synthesizer able to lock on to said RF-synchronizing signal and providing for synchronous detection of said RF-probe signal; and a measurement device for detecting attenuation and phase shift affects on said RF-probe signal by an anomalous media that intervenes between the transmitter and receiver.