  We present a one-loop calculation of the oblique S parameter within Higgsless
models of electroweak symmetry breaking. We have used a general effective
Lagrangian with at most two derivatives, implementing the chiral symmetry
breaking SU(2)_L x SU(2)_R -> SU(2)_{L+R} with Goldstones, gauge bosons and one
multiplet of vector and axial-vector resonances. The estimation is based on the
short-distance constraints and the dispersive approach proposed by Peskin and
Takeuchi.
