The choice of materials for communication towers directly affects the propagation path of electromagnetic waves.
Ordinary steel structures reflect radio waves, potentially causing signal attenuation or phase shift. Aesthetically pleasing towers often use non-metallic or composite materials for the outer decorative layer, such as fiberglass or special resins. These materials have a dielectric constant close to that of air, reducing beam refraction and absorption.
Meanwhile, the internal load-bearing frame still uses high-strength steel to ensure resistance to wind and snow loads. This layered structure of "inner steel, outer non-metallic" achieves a balance between mechanical strength and electromagnetic transparency, avoiding signal power loss caused by excessively thick decorative layers.