  We report on a search for charged massive resonances decaying to top ($t$)
and bottom ($b$) quarks in the full data set of proton-antiproton collisions at
center-of-mass energy of $\sqrt{s} = 1.96$ TeV collected by the CDF~II detector
at the Tevatron, corresponding to an integrated luminosity of 9.5 $fb^{-1}$. No
significant excess above the standard model (SM) background prediction is
observed. We set 95% Bayesian credibility mass-dependent upper limits on the
heavy charged particle production cross section times branching ratio to $t b$.
Using a SM extension with a $W^{\prime}$ and left-right-symmetric couplings as
a benchmark model, we constrain the $W^{\prime}$ mass and couplings in the 300
to 900 GeV/$c^2$ range. The limits presented here are the most stringent for a
charged resonance with mass in the range 300 -- 600 GeV/$c^2$ decaying to top
and bottom quarks.
