  We analyze unitarity violation in 5D Higgsless theories using tree level
unitarity bounds on gauge vector bosons scatterings. Both elastic and inelastic
amplitudes are analytically computed and used to estimate the perturbativity
cutoff. The results are compared with 5D NDA estimates. The inelastic channels
are essential for a correct determination of the cutoff when light KK states
are present. In flat space Higgsless models the cutoff is always quite low, and
can be raised at 5 TeV only if one has the first KK state at around 500 GeV,
which is disfavored by Electroweak data.
