  Recently Barbieri, et al. have introduced a formalism to express the
deviations of electroweak interactions from their standard model forms in
"universal" theories, i.e. theories in which the corrections due to new physics
can be expressed solely by modifications to the two-point correlation function
of electroweak gauge currents of fermions. The parameters introduced by these
authors are defined by the properties of the correlation functions at zero
momentum, and differ from the quantities calculated by examining the on-shell
properties of the electroweak gauge bosons. In this letter we discuss the
relationship between the zero-momentum and on-shell parameters. In addition, we
present the results of a calculation of these zero-momentum parameters in an
arbitrary Higgsless model in which the low-energy rho parameter is one and
which can be deconstructed to a linear chain of SU(2) groups adjacent to a
chain of U(1) groups. Our results demonstrate the importance of the universal
"non-oblique" corrections which are present and elucidate the relationships
among various calculations of electroweak quantities in these models. Our
expressions for these zero-momentum parameters depend only on the spectrum of
heavy vector-boson masses; therefore, the minimum size of the deviations
present in these models is related to the upper bound on the heavy vector-boson
masses derived from unitarity. We find that these models are disfavored by
precision electroweak data, independent of any assumptions about the background
metric or the behavior of the bulk coupling.
