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Deep polarimetric Westerbork observations of the galaxy cluster Abell 2256are presented, covering a frequency range of 325-377 MHz. The central halosource has a diameter of the order of 1.2 Mpc (18'), which is somewhat largerthan at 1.4 GHz. With alpha=-1.61+/-0.04, the halo spectrum between 1.4 GHz and22.25 MHz is less steep than previously thought. The centre of the ultra steepspectrum source in the eastern part of the cluster exhibits a spectral breaknear 400 MHz. It is estimated to be at least 51 million years old, but possiblyolder than 125 million years. A final measurement requires observations in the10-150 MHz range. It remains uncertain whether the source is a radio tail ofFabricant galaxy 122, situated in the northeastern tip of the source. Faradayrotation measure synthesis revealed no polarized flux at all in the cluster.The polarization fraction of the brightest parts of the relic area is less than1%. The RM-synthesis nevertheless revealed 9 polarized sources in the fieldenabling an accurate measurement of the Galactic Faraday rotation (-33+/-2 radm^{-2} in front of the relic). Based on its depolarization on longerwavelengths, the line-of-sight magnetic field in relic filament G is estimatedto be between 0.02 and 2 uG. A value of 0.2 uG appears most reasonable giventhe currently available data.

Deep Westerbork observations of Abell 2256 at 350 MHz