1. A method of determining refractivity properties of the Earth's atmosphere comprising: providing a plurality of antenna elements configured to measure an actual arrival angle of a signal, the antenna elements separated by a predetermined vertical distance; providing a receiver device, the receiver device being coupled to each of the plurality of antenna elements and configured to compute a nominal arrival angle of the signal based on data transmitted from a source of the signal; receiving the signal at each of the plurality of antenna elements; measuring an actual arrival angle of the signal using the plurality of antenna elements; determining a difference between the nominal arrival angle of the signal and the actual arrival angle of the signal; calculating a refractive bending angle of the signal based on the determined difference between the actual and nominal arrival angles; and transforming the refractive bending angle of the signal into a profile of physical properties of the atmosphere.