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We identify a counterpart to a Galactic supershell in diffuse radiopolarisation, and use this to determine the magnetic fields associated withthis object. GSH 006$-$15$+$7 has perturbed the polarised emission at2.3$\,$GHz, as observed in the S-band Polarisation All Sky Survey (S-PASS),acting as a Faraday screen. We model the Faraday rotation over the shell, andproduce a map of Faraday depth over the area across it. Such models requireinformation about the polarised emission behind the screen, which we obtainfrom the Wilkinson Microwave Anisotropy Probe (WMAP), scaled from 23$\,$GHz to2.3$\,$GHz, to estimate the synchrotron background behind GSH 006$-$15$+$7.Using the modelled Faraday thickness we determine the magnitude and theplane-of-the-sky structure of the line-of-sight magnetic field in the shell. Wefind a peak line-of-sight field strength of $|B_\parallel|_\text{peak} =2.0\substack{+0.01 \\ -0.7}\,\mu$G. Our measurement probes weak magnetic fieldsin a low-density regime (number densities of $\sim0.4\,$cm$^{-3}$) of the ISM,thus providing crucial information about the magnetic fields in thepartially-ionised phase.

Ghost of a Shell: Magnetic Fields of Galactic Supershell GSH 006$-$15$+$7