Described is a tilt meter for monitoring angle shift in an incident signal. The tilt meter includes a resonator for receiving an incident signal from a signal transmitter and outputting a resonated signal. An incident angle exists between a plane normal to the resonator and the incident signal. A sensor is included for sensing the resonated signal. A processor is connected with the sensor and is configured to compare intensities of the incident signal and the resonated signal. Based upon the comparison, the processor determines if and by how much the incident angle has changed.