  A Higgsless electroweak theory may be populated by spin-1 resonances around E
~ 1TeV as a consequence of a new strong interacting sector, frequently proposed
as a tool to smear the high-energy behaviour of scattering amplitudes, for
instance, elastic gauge boson scattering. Information on those resonances, if
they exist, must be contained in the low-energy couplings of the electroweak
chiral effective theory. Using the facts that: i) the scattering of
longitudinal gauge bosons, W_L, Z_L, can be well described in the high-energy
region E >> M_W by the scattering of the corresponding Goldstone bosons
(equivalence theorem) and ii) the zeros of the scattering amplitude carry the
information on the heavier spectrum that has been integrated out; we employ the
O(p^4) electroweak chiral Lagrangian to identify the parameter space region of
the low-energy couplings where vector resonances may arise. An estimate of
their masses is also provided by our method.
