The towers on Mogami supported wire radio aerials

What was the purpose of the tower-like structures around Mogami's aft turrets?

They primarily supported the ship's wire radio aerials, although some reports have proposed additional radar or fire-control roles.

The tall structures around Mogami's aft turrets primarily supported wire radio aerials running around the ship. Some reports attribute other functions, including radar or fire-control support, but those alternatives are not established. Their visual prominence can make an ordinary communications function look more exotic.