There are two U-boat versions of the FuG 200 Hohentwiel used during World War II; FuMO 61 Hohentwiel U and the FuMO 65 Hohentwiel U1. The U-boat versions were easier to maintain and more reliable compared with the other versions. However, the U-boat versions had several disadvantages, the smaller dimension of the antenna and the height of the antenna installation. The antenna was restricted to a smaller dimension as it had to fit within a small area on the port side of the conning tower. In addition, the reduced height of the antenna installation impaired the range. Both U-boat versions had ranges of between for naval targets and between at an altitude of . Resolution was about 3 degrees, and at short range its range accuracy was . Both U-boat versions worked at a frequency 556 MHz and had four rows of six dipoles. Before the U-boat could dive, the antenna needed to be retracted into a well on the conning tower. Both U-boat antenna versions were wide by in height, and total overall dimensions of the antenna frame was .