A dc-SQUID planar gradiometer has been fabricated with YBa2Cu3O7-δ step-edge Josephson junctions on a 10mm×10mm single crysta l SrTiO3 ［100］ substrate. The gradiometer has a pair of pickup loop s with an area of 33 mm2 and the baseline of 45mm. The system opera tes well in unshielded environment. A rejection of common mode fields of 14×1 02 in all directions and a field gradient sensitivity (white noise) b etter than 8pT/cmHz at 77K have been achieved.