report the results of a search for a W' boson produced in p (p) over bar co
llisions at a center-of-mass energy of 1.8 TeV using a 107 pb(-1) data samp
le recorded by the Collider Detector at Fermilab. We consider the decay cha
nnel W' --> mu nu(mu), and search for anomalous production of high transver
se mass py, lepton pairs. We observe no excess of events above background a
nd set limits on the rate of W' boson production and decay relative to stan
dard model W boson production and decay using abt of the transverse mass di
stribution observed. If we assume standard model strength couplings of the
W' boson to quark and lepton pairs, we exclude a W' boson with invariant ma
ss less than 660 GeV/c(2) at 95% confidence level.