The aerodynamic characteristics of the member’s cross-sections used in telecommunication lattice towers are vital for accurately calculating wind loads acting on these structures. This paper aims to determine the aerodynamic coefficients in a member´s section compound with two equal-leg angles, as part of a self-supporting triangular telecommunications tower. The coefficients were obtained using Computational Fluid Dynamics simulations, with the open-source software OpenFOAM. The numerical models were implemented using Reynolds Averaged Navier–Stokes Simulations, in two dimensions at a reduced scale with an unstructured mesh, implementing the Pressure Implicit Linked Equations algorithm. The numerical models were calibrated based on experimental tests performed in a wind tunnel. Two additional sections were used for validation, with their aerodynamic coefficients reported in the wind load standards reviewed. The results show good agreement between the aerodynamic coefficient values obtained from both the wind tunnel tests and the simulations for angles of attack at 0°, 45°, 90°, 135°, and 180°. The coefficients calculated were employed to determine the wind load and axial force values on the supports of a self-supporting triangular lattice tower. Increases of up to 43.8% in the wind load and 36.8% in axial force values of the tower reactions were reported.