We combine simultaneous WIND/GEOTAIL direction-finding analyses of terrestrial 2 fp radio emission to provide the first 3-D source location by two spacecraft triangulation. These observations were made when WIND and GEOTAIL were relatively close to the electron foreshock and to each other. For two cases presented the 2 fp radio source centroid was stationary and located in the upstream wing of the electron foreshock region some 15--50RE from the contact point. In a third case the 2 fp source centroid followed the change in orientation of the electron foreshock.¿ 1997 American Geophysical Union