of the corner posts 43 the mean slant y of the transition unit 50 u2014 defined as the angle subtended between the vertical and a conceptual line from the maximum horizontal expanse in the upper region 60 to the maximum horizontal expanse in the lower region 70 u2014 is substantially larger than the slant of the corner posts 43 of the lattice tower 42 and of course also larger than that of the tubular tower since latter is cylindrical in the shown embodiment using a cylindrical tubular tower allows economical manufacture it is possible solely because the lattice tower is made very rigid whereby the overall structure can be made sufficiently rigid even when foregoing widening the tubular tower to increase rigidity a cylindrical tubular tower is especially appropriate when the azimuth bearing the nacelle being rotatably mounted on the tower is selected to be very large because this selection allows making the tubular tower very rigid without widening it in order to easily carry out the construction by welding the junction plate 72 subtends in the lower region 70 of the transition unit 50 a slant that differs from that of the corner posts 43 as a result the connection is implemented using junction plates 76 that are selected thick enough to absorb the forces arising from deflecting the applied loads the bent junction parts may be thick metal plate and where called for welded steel.