  We study the critical current I_c dependence on applied magnetic field H for
multifacet YBa_2Cu_3O_{7-\delta}-Au-Nb ramp-type zigzag Josephson junctions.
For many experiments one would like to apply a homogeneous field in the
junction plane. However, even tiny misalignments can cause drastic deviations
from homogeneity. We show this explicitly by measuring and analyzing I_c vs. H
for an 8 facet junction, forming an array of 4\times(0-\pi)-segments. The ramp
angle is \theta_r=8^\circ. The facet width is 10\,\mum. H is applied under
different angles \theta relative to the substrate plane and different angles
\phi relative to the in-plane orientation of the zigzags. We find that a
homogeneous flux distribution is only achieved for an angle \theta_h\approx
1^\circ - 2^\circ and that even a small misalignment \sim 0.1^\circ relative to
\theta_h can cause a substantial inhomogeneity of the flux density inside the
junction, drastically altering its I_c vs. H interference pattern. We also
show, that there is a dead angle \theta^*_d relative to \theta_h of similar
magnitude, where the average flux density completely vanishes.
