Experimental studies of the dynamic behavior of metal supports of an overhead line (OL) under the action of wind loads are presented. The methodology and scheme of the experiment execution in two stages on the anchor-angular and intermediate supports of the 220 kV overhead line “Zmiev TPP – Zalyutino” have been developed. At the first stage, the excitation of vibrations of the support structures was achieved using wind action, at the second stage, free vibrations of the “support – wires” system were recorded, which were created using manual resonance. Graphs of stress changes in structural elements of tower lattice supports in the wind along and across the overhead line are presented. The main natural frequencies of vibrations of metal supports have been experimentally determined, which are displayed on the free vibration damping graphs. Analysis of the obtained spectra of longitudinal pulsations of wind speed made it possible to conclude that the wind flow is stationary. The necessity of frequency detuning of the overhead line support structure from the natural frequency of 2.2 Hz has been established, since an external effect with this frequency is possible when the live wire breaks in one of the phases. It is necessary to improve not only the principles of monitoring and observing the behavior of structures in the wind flow, but also to develop simple methods to take into account the dynamic component under the action of natural-climatic and emergency loads, which by their nature are dynamic phenomena.