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We present a low-frequency, broadband polarization study of the FRII radiogalaxy PKS J0636-2036 (z = 0.0551), using the Murchison Widefield Array (MWA)from 70 to 230 MHz. The northern and southern hotspots (separated by ~14.5' onthe sky) are resolved by the MWA (3'.3 resolution) and both are detected inlinear polarization across the full frequency range. A combination of Faradayrotation measure (RM) synthesis and broadband polarization model-fitting areused to constrain the Faraday depolarization properties of the source. For theintegrated southern hotspot emission, two RM component models are stronglyfavoured over a single RM component, and the best-fitting model requiresFaraday dispersions of approximately 0.7 and 1.2 rad/m$^2$ (with a mean RM of~50 rad/m$^2$). High resolution imaging at 5" with the ATCA shows significantsub-structure in the southern hotspot and highlights some of the limitations inthe polarization modelling of the MWA data. Based on the observeddepolarization, combined with extrapolations of gas density scaling-relationsfor group environments, we estimate magnetic field strengths in theintergalactic medium between ~0.04 and 0.5 {\mu}G. We also comment on futureprospects of detecting more polarized sources at low frequencies.

Faraday rotation at low frequencies: magnetoionic material of the large FRII radio galaxy PKS J0636-2036