  We present a first estimate of the reach of future pp colliders, the 14 TeV
LHC and a futuristic 100 TeV pp collider, on a vector resonance, specifically a
$W^{'}$, produced via weak-boson-fusion, and decaying dominantly into $tb$. The
analysis is motivated by Composite Higgs, Randall-Sundrum and Little Higgs
scenarios, which predict the existence of vector resonances with a large
coupling to $W$ and $Z$ longitudinal bosons. In particular, in composite Higgs
models with partial compositeness, the standard Drell-Yan production channel is
suppressed at large coupling while the weak-boson-fusion is enhanced and could
thus provide a unique opportunity to directly test the large coupling regime of
the theory. We outline a search strategy for the $W^{'}$ in the
weak-boson-fusion channel and present the reach of future colliders on the
$W^{'}$ mass-coupling parameter space.
