CHANG-ES III: UGC10288 -- An Edge-on Galaxy with a Background
  Double-lobed Radio Source
  This 3rd paper in the CHANG-ES series shows the first results from our
regular data taken with the Karl G. Jansky Very Large Array (JVLA). The edge-on
galaxy, UGC 10288, has been observed in the B, C, and D configurations at
L-band (1.5 GHz) and in the C and D configurations at C-band (6 GHz) in all
polarization products. We show the first spatially resolved images in these
bands,the first polarization images, and the first composed image at an
intermediate frequency (4.1 GHz) which has been formed from a combination of
all data sets.
  A surprising new result is the presence of a strong, polarized, double-lobed
extragalactic radio source ({\it CHANG-ES A}) almost immediately behind the
galaxy and perpendicular to its disk. The core of {\it CHANG-ES A} has an
optical counterpart at a photometric redshift of $z_{phot}\,=\,0.39$; the
southern radio lobe is behind the disk of UGC 10288 and the northern lobe is
behind the halo region. This background `probe' has allowed us to do a
preliminary Faraday Rotation analysis of the foreground galaxy, putting limits
on the regular magnetic field and electron density in the halo of UGC 10288 in
regions in which there is no direct detection of a radio continuum halo.
  We have revised the flux densities of the two sources individually as well as
the star formation rate (SFR) for UGC 10288. UGC 10288 would have fallen well
below the CHANG-ES flux density cutoff, had it been considered without the
brighter contribution of the background source.
  UGC 10288 shows discrete high-latitude radio continuum features, but it does
not have a {\it global} radio continuum halo. The total minimum magnetic field
strength at a sample position in the arc is $\sim$ 10 $\mu$G. Thus, this galaxy
still appears to be able to form substantial high latitude, localized features
in spite of its relatively low SFR.
