of the strakes 2 that are attached to a wind turbine tower 1 the strakes 2 are wrapped around the wind turbine tower 1 whereby the angle of inclination of the strakes in respect to the longitudinal axis of the wind turbine tower is between 10 u00b0 and 80 u00b0 the strakes 2 show a triangular shape in a crosscut perpendicular to the longitudinal axis of the strake the strakes 2 are non permanently attached to the tower 1 fig3 shows a detail of a strake 2 the strake 2 comprises a rope 5 that leads through the strake in a longitudinal direction the segments 6 a 6 b 6 c 6 d and 6 e cover most part of the rope 5 the segments 6 a 6 b 6 c 6 d and 6 e of the strake 2 show a triangular shape in a crosscut perpendicular to the longitudinal axis of the strake 2 when the strake 2 is attached to the tower the rope 5 is wrapped around the tower and the segments 6 a to 6 e abut on the outer wall of the tower the surface of the segments 6 of the strake 2 interacts with the wind and deflects the wind in a way that the generation of vortex on the leeward side of the tower is reduced fig4 shows a second detail of a strake 2 the strake 2 comprises a rope 5 that leads through the strake 2 in a longitudinal direction the segment 6 a 6 b and 6 c cover most of the length of the rope 5 the segments 6 a 6 b and 6 c comprise an outer structure 7 a 7 b and 7 c inside of.