Abstract: Antirotation method to straighten sections (11), such sections (11) having a solid or hollow cross section and possibly having externally a round or ribbed cross section, or ridges, or else TOR type helicoidal ribbing, or a three-lobed, cross-shaped or star-shaped cross section, etc., and being in the form of bars or coils in a wound bundle (12) and possibly comprising a lengthwise twist, the section (11) being guided by grooves (21) comprises in rolls (18) of processing assemblies (16-17-23) and being made to pass through a guide and prestraightener assembly (16) and through two straightening assemblies (17) before being rendered linear (20) and then finished by a finishing assembly (23), the section (11) being diverted during the straightening step along at least one S-shaped or Z-shaped half-loop (14) and remaining positioned substantially on one single plane until it reaches the finishing assembly (23).