  We consider the Strongly-Coupled Standard Model (Abbott-Farhi model)
including an isotriplet of W' vector bosons. First we calculate the corrections
to the low-energy theory, which can be effectively summarized in terms of the
parameters S, T and U. Then we use high- precision electroweak measurements to
constrain the mass and couplings of the W'. The W' couplings are restricted to
be unnaturally small, and we conclude that this model is no longer compelling
as a theory of the electroweak interactions.
