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It has been recently argued that realistic models with warped extradimensions can have Kaluza-Klein particles accessible at the Large HadronCollider if a custodial symmetry, SU(2)_V \times P_{LR}, is used to protect theT parameter and the coupling of the left-handed bottom quark to the Z gaugeboson. In this article we emphasize that such a symmetry implies that the loopcorrections to both the T parameter and the Z b_L \bar{b}_L coupling arecalculable. In general, these corrections are correlated, can be sizable, andshould be considered to determine the allowed parameter space region in modelswith warped extra dimensions and custodial symmetry, including Randall-Sundrummodels with a fundamental Higgs, models of gauge-Higgs unification andHiggsless models. As an example, we derive the constraints that arise on arepresentative model of gauge-Higgs unification from a global fit to theprecision electroweak observables. A scan over the parameter space typicallyleads to a lower bound on the Kaluza-Klein excitations of the gauge bosons ofabout 2-3 TeV, depending on the configuration. In the fermionic sector one canhave Kaluza-Klein excitations with masses of a few hundred GeV. We present theconstraints on these light fermions from recent Tevatron searches, and exploreinteresting discovery channels at the LHC.Comment: 38 pages, 8 figure

Electroweak constraints on warped models with custodial symmetry