  We consider the synchrotron emission from electrons out in the Galactic halo
bubble region where the Fermi bubble structures reside. Utilising a simple
analytical expression for the non-thermal electron distribution and a toy
magnetic field model, we simulate polarised synchrotron emission maps at a
frequency of 30~GHz. Comparing these maps with observational data, we obtain
constraints on the parameters of our toy Galactic halo bubble magnetic field
model. Utilising this parameter value range for the toy magnetic field model,
we determine the corresponding range of arrival directions and suppression
factors of ultra high energy cosmic rays (UHECRs) from potential local source
locations. We find that high levels of flux suppression (down to 2\%) and large
deflection angles ($\geq 80^{\circ}$) are possible for source locations whose
line-of-sight pass through the Galactic halo bubble region. We conclude that
the magnetic field out in the Galactic halo bubble region can strongly dominate
the level of deflection UHECRs experience whilst propagating from local sources
to Earth.
