  We discuss the dynamics of microquasar jets in the interstellar medium, with
specific focus on the effects of the X-ray binaries' space velocity with
respect to the local Galactic standard of rest. We argue that, during late
stages in the evolution of large scale radio nebulae around microquasars, the
ram pressure of the interstellar medium due to the microquasar's space velocity
becomes important and that microquasars with high velocities form the Galactic
equivalent of extragalactic head-tail sources, i.e., that they leave behind
trails of stripped radio plasma. Because of their higher space velocities,
low-mass X-ray binaries are more likely to leave trails than high-mass X-ray
binaries. We show that the volume of radio plasma released by microquasars over
the history of the Galaxy is comparable to the disk volume and argue that a
fraction of a few percent of the radio plasma left behind by the X-ray binary
is likely mixed with the neutral phases of the ISM before the plasma is removed
from the disk by buoyancy. Because the formation of microquasars is an
unavoidable by-product of star formation, and because they can travel far from
their birth places, their activity likely has important consequences for the
evolution of magnetic fields in forming galaxies. We show that radio emission
from the plasma inside the trail should be detectable at low frequencies. We
suggest that LMXBs with high detected proper motions like XTE J1118+480 will be
the best candidates for such a search.
