Abstract: A radar level gauge system, for determining a filling level of a product contained in a tank, comprising a transceiver configured to transmit and receive electromagnetic signals, a probe arranged to extend towards and into the product inside the tank and configured to guide transmitted signals towards a surface of the product, where signals are reflected, and reflected signals back from the surface of the product. The probe has a mechanical and direct electrical connection to a conductive tank structure. The radar level gauge system further comprises processing circuitry connected to the transceiver and configured to determine the filling level based on the transmitted and reflected signals, and a probe coupling device connected to the transceiver.