Described is an invention to attenuate radar signal for measuring liquid metal levels in restricted openings. The invention may utilize channels or guides, such as fake walls, that allow a radar measurement device to receive an accurate signal. As the channels extend further, such as past 115 mm, the walls may remove the oscillation of the radar signal, providing for an accurate measurement of molten metal levels. Radar measurements can operate at a sweet spot, such as at 115 mm, by the new operational height obtained using the channels or guides. The graph below shows a range of distances that the radar is able to obtain accurate signals before oscillations begin affecting measurements. The experiment of Figure 1 shows a radar measuring water level as a control. The attenuated signal is observed at distances above about 90 mm and as the distance between the water level and the radar becomes shorter, more oscillations are observed.

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