Abstract: The Space Lattice Passive Repeater redirects radio waves in two directions, directly opposite to each other, and both perpendicular to the original path of radio wave propagation. The redirected radio waves, in the perpendicular paths, are polarized differently, by ninety degrees, from the original radio wave. The device is composed of an array of thin, stacked, metallic, plates, insulated from each other, whose vertical spacing, between the plates, is computed from the operating wavelength, the ratio of the moist adiabatic lapse rate to the dry adiabatic lapse rate, Bragg's Law, and its' derivatives.