  We study the three-dimensional antiferromagnetic Ising model in both uniform
longitudinal ($H$) and transverse ($\Omega $) magnetic fields by using the
effective-field theory with finite cluster $N=1$ spin (EFT-1). We analyzed the
behavior of the magnetic susceptibility to investigate the reentrant phenomena
we have seen the same phase diagram previously obtained in another papers. Our
results shows the presence of two divergences in the susceptibility that
indicates the existence of a reentrant behaviour.
