For low electrically conducting anisotropic ferromagnetic metals an analytical FMR theory was deduced, which considers the influence of dielectric permittivity (the displacement current in Maxwell equations); it is applicable especially at frequencies in the mm or far infrared region. The dispersion relations of the AR effect were shown as valid also in this FMR case (forΩ2L2 ≫e r 2 ). The surface impedance (of a small asymmetry due to the dielectric permittivity), the FMR point shift (to the higher values of static magnetic fields), and the expressions for the ellipticity factors and hf components of magnetization and magnetic fields were derived; only the electromagnetic wave was shown as predominantly excited in the FMR of low conductive materials.