We study the synthesis and structural and magnetic characterization of the new compound family Sr2GdRu1−xRexOy, with doping levels at 3%, 6%, 9%, and 12%. X-ray diffractograms revealed that the samples crystallize in a monoclinic structure, and exhibit a strong distortion of the octahedron Ru(Re)O6/GdO6 lattice. Magnetic characterization revealed non-ideal antiferromagnetic behavior, with Néel temperatures close to 25 K, and an interesting metamagnetic feature below applied magnetic fields between 1.0 and 1.4 T. The existence of a Re doping level limit that favors an ideal antiferromagnetic character of the perovskite is discussed.