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In this paper we compute the the one-loop chiral logarithmic corrections tothe S and T parameters in a highly deconstructed Higgsless model with onlythree sites. In addition to the electroweak gauge bosons, this model contains asingle extra triplet of vector states (which we denote \rho^{\pm} and \rho^0),rather than an infinite tower of "KK" modes. We compute the corrections to Sand T in 'tHooft-Feynman gauge, including the ghost, unphysicalGoldstone-boson, and appropriate "pinch" contributions required to obtaingauge-invariant results for the one-loop self-energy functions. We demonstratethat the chiral-logarithmic corrections naturally separate into two parts, amodel-independent part arising from scaling below the \rho mass, which has thesame form as the large Higgs-mass dependence of the S or T parameter in thestandard model, and a second model-dependent contribution arising from scalingbetween the \rho mass and the cutoff of the model. The form of the universalpart of the one-loop result allows us to correctly interpret thephenomenologically derived limits on the S and T parameters (which depend on a"reference" Higgs-boson mass) in this three-site Higgsless model. Higgslessmodels may be viewed as dual to models of dynamical symmetry breaking akin to"walking technicolor", and in these terms our calculation is the first tocompute the subleading 1/N corrections to the S and T parameters. We alsodiscuss the reduction of the model to the ``two-site'' model, which is theusual electroweak chiral lagrangian, noting the ``non-decoupling''contributions present in the limit as M_\rho goes to infinity.Comment: 58 pages; uses JHEP and axodraw. Extensively corrected to incorporate  consistent perturbative expansion, additional pinch contributions, and  running of delocalization parameter. Footnotes adde

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

One-loop corrections to the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>T</mml:mi></mml:math>parameters in a three site Higgsless model

One-loop corrections to theSandTparameters in a three site Higgsless model