  We investigate $W'$ interpretations for the ATLAS 2 TeV diboson anomalies.
The roles of the unitarity sum rules, which ensure the perturbativity of the
longitudinal vector boson scattering amplitudes, are emphasized. We find the
unitarity sum rules and the custodial symmetry are powerful enough to predict
various nontrivial relations among $WWZ'$, $WZW'$, $WWh$, $WW'h$ and $ZZ'h$
coupling strengths in a model independent manner. We also perform surveys in
the general parameter space of $W'$ models and find the ATLAS 2 TeV diboson
anomalies may be interpreted as a $W'$ particle of the three site moose model,
i.e., a Kaluza-Klein like particle in a deconstructed extra dimension model. It
is also shown that the non standard-model-like Higgs boson is favored by the
present data to interpret the ATLAS diboson anomalies as the consequences of
the $W'$ and $Z'$ bosons.
