The Type 13 was a ladder-type radar antenna that was normally mounted on the mainmast of warships (towards the stern). It was widely used in the Imperial Japanese Navy in WWII. It had a range of 100 km/62 miles for aircarft groups and 50 km/31 miles for single aircarft. Large warships such as the battleship Yamato have a pair of these antenna mounted.
Type 13 was another standard air search radar in the Imperial Japanese Navy during WWII. The ladder-type antenna had a power output of 10kW; a detection range of 100 km/62 miles for aircraft groups, and 50 km/31 miles for single aircraft. The antenna was normally installed on the mainmast of the warships (towards the stern), and some large warships such as the Yamato class battleships had two of these antenna.