We find positive solutions to a nonlinear equation of Klein-Gordon type. Our analysis is carried out by truncating the related functional and estimating mountain pass solutions by Moser's iterative scheme.492383389Berestycki, H., Lions, P.-L., Existence of a ground state in nonlinear equations of the Klein-Gordon type (1980) Variational Inequalities and Complementarity Problems, Proc. Int. School of Nuclear Physics, Erice, 1978, pp. 35-51. , WileyBerestycki, H., Lions, P.-L., Nonlinear scalar field equations, 1, Existence of a ground state (1983) Arch. Ration. Mech. Analysis, 82, pp. 313-345Chaljub-Simon, A., Volkmann, P., Existence of ground states with exponential decay for semilinear elliptic equations in Rn (1988) J. Diff. Eqns, 76, pp. 374-390Ding, W.Y., Ni, W.M., On the existence of positive entire solutions of a semilinear elliptic equation (1986) Arch. Ration. Mech. Analysis, 91, pp. 283-308Lions, P.-L., The concentration-compactness principle in the calculus of variations, the limit case, I (1985) Rev. Mat. Iber., 1, pp. 145-201Otani, M., Existence and nonexistence of nontrivial solutions of some nonlinear degenerate elliptic equations (1988) J. Funct. Analysis, 76, pp. 140-159Strauss, W., Existence of solitary waves in higher dimensions (1977) Commun. Math. Phys., 55, pp. 149-162Zhu, X.P., Multiple entire solutions of a semilinear elliptic equation (1988) Nonlin. Analysis, 12, pp. 1297-1316