A cantilever supports a catenary to supply energy to a vehicle. The cantilever includes a cross-member adapted to be attached to a support structure, the cross-member extending along a longitudinal axis (X-X), and at least one attachment connected to the cross-member. The cross-member includes an outer surface, the outer surface including at least a first side having a non-circular shape in a section plane (II-II) that is orthogonal to the longitudinal axis (X-X). The attachment includes at least one collar encircling the cross-member, and the collar includes at least one contact face in contact with the at least first side.