The Russian 460 metres radio masts are among the most secret supertall structures ever built.
Three such masts, which were developed by Stako, were erected in mid-1980s near Inta, Dudinka and Taymylyr as masts for the North Siberian Chayka Chain for transmitting navigation signals on 100 kHz with 1200 kW.
All these masts are grounded lattice structures of tubular steel elements with triangular cross section.
The side length of the triangle of the mast body is 3.6 metres.
These masts were at completion the tallest structures in Asia and are still the second-tallest in Russia.