A receiver performs interference mitigation under blind or semi-blind conditions using diversity present in the signal of interest or in the interferer. The kit includes a trial assembly including a trial body portion having a trial bore defined therein, and a trial head portion having a trail head member which includes a trial offset indicia, and an eccentrically located trial stem extending from the trial head member, the trial head stem being configured to be received within the trial bore. In another illustrative embodiment, the reactant gas exiting the gas delivery system is directed so as to cover substantially all of an area defined by an upper surface of the wafer. The GNSS receiver may be operable to detect, for example, signal-to-noise ratios or carrier-to-noise density ratios of the currently visible GNSS satellites utilizing the sniff channel circuits. Also disclosed are magnetically modified electrodes containing metalloproteins.