Below Threshold Z' Mass and Coupling Determinations at the NLC

We examine the capability of the NLC to determine the mass as well as the couplings to leptons and $b$-quarks of a new neutral gauge boson below production threshold. By using data collected at several different values of $\sqrt s$, we demonstrate how this can be done in a model-independent manner. [To appear in {\it Physics and Technology of the Next Linear Collider}, eds. D.\ Burke and M.\ Peskin]