  We explore the phenomenology of a stabilized modulus field in the
Randall-Sundrum scenario. It is found that if the large separation between
branes arises from a small bulk scalar mass then the modulus (i.e. radion) is
likely to be lighter than the lowest Kaluza-Klein excitations of bulk fields,
and consequently may be the first direct signature of the model.
Four-dimensional general covariance completely determines the couplings of the
modulus to Standard Model fields. The strength of these couplings is determined
by a single parameter which is set by the TeV rather than the Planck scale.
