Transport properties of an epitaxial film of La 0.7 Sr 0.3 MnO 3 (LSMO), deposited epitaxially on a LaAlO 3 bi-crystal substrate having a misorientation angle of 9.2°, have been studied. The film was patterned into a meander containing 100 grain boundaries. The resistivity of the sample exhibits two components; one originating from the grain boundary regions, and one from the LSMO elements in the meander; the latter contribution is similar to the resistivity of a reference epitaxial LSMO film. The low- (<0.5T) and high- (up to 6T) field magnetoresistance were also studied. The meander show a large low-field magnetoresistance, increasing with decreasing temperature, and a constant high field slope of the magnetoconductance results that are well explained by a two-step spin polarized tunneling model.