The FuMG 41/42 Mammut was a long-range, phased array, early warning radar built by Germany in the latter days of World War II.

The arrays were fixed and the beam could be electronically steered on a 100° arc in front and behind the antenna, leaving 80° blind arcs on each side.

It was the world's first phased array radar[citation needed] and was able to detect targets flying at an altitude of 8,000m at a range of 300 km.

The British intelligence codename, "hoarding", was probably related to the shape of the large array.

[citation needed] As late in the war as April 20, 1945, intelligence reports reflected the erroneous opinion that only development prototypes existed but no operational stations had been fielded.