Power Transmission Line Towers and Communication Masts are lattice and polygonal structures made of steel sections and tubes for overhead power lines (35–500 kV) and communication base stations (up to 100 m). Lattice towers: made of angle bars and strips, bolted assembly on-site — transportable in disassembled form. Polygonal (MGO): solid-welded from sheet metal, more compact, aesthetically pleasing, quick installation. Anti-corrosion protection: hot-dip galvanizing (GOST 9.307, Zn thickness 80–120 µm, protection period 30–50 years). Steels: St3sp, 09G2S, 15KhSND. Design according to PUE and SP 16.13330. Foundations: pile or anchor. Advantages of polygonal towers (MGO): compactness (1 section = 1 truck), fast installation (crane + flange assembly in 2–4 hours), aesthetics (for urban environments). Lattice towers: transportable in disassembled form (1 wagon = 5–10 towers), repairable (replacement of individual elements). Manufacturing lead time 4–8 weeks. Foundation bolts included.