On the problem of ambiguity of electromagnetic potential

The electromagnetic potential must be considered as some relative measure describing deviation of the distributed electromagnetic oscillating system (Minkowski space-time) from the “undisturbed” state (when both natural and forced oscillations are absent). Therefore, there is no ambiguity in the gauge of one: all components of the potential four-vector are asymptotically verging towards zero while the distance from all free charges and currents enlarges. Such interpretation turns the electromagnetic potential into a physically real value.