The Rosemount Parabolic Antenna Gauges TGU 51 is a standard Tank Gauge Unit (TGU) that is used in tanks on large tankers. The radar beam of the Rosemount Parabolic Antenna Gauges TGU 51 is very narrow which makes it easy to find a good location so that the radar beam can pass unobstructed in complicated tanks with a lot of internal structures. This is due to the large antenna diameter.