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We present multifrequency observations of the radio source 3CR 403.1, anearby (z=0.055), extended ($\sim$0.5 Mpc) radio galaxy hosted in a smallgalaxy group. Using new high frequency radio observations from the SardiniaRadio Telescope (SRT), augmented with archival low frequency radioobservations, we investigated radio spectral and polarimetric properties of 3CR403.1. From the MHz-to-GHz spectral analysis, we computed the equipartitionmagnetic field in the lobes to be B$_{eq}$=2.4~$\mu$G and the age of the sourceto be $\sim$100 Myr. From the spectral analysis of the diffuse X-ray emissionwe measured the temperature and density of the intracluster medium (ICM). Fromthe SRT observations, we discovered two regions where the radio flux density isbelow the background value. We computed the Comptonization parameter both fromthe radio and from the X-ray observations to test if the Sunyaev-Zel'dovicheffect is occurring here and found a significant tension between the twoestimates. If the negative signal is considered as real, then we speculate thatthe discrepancy between the two values could be partially caused by thepresence of a non-thermal bath of mildly relativistic ghost electrons. From thepolarimetric radio images, we find a net asymmetry of the Faraday rotationbetween the two prominent extended structures of 3CR 403.1, and constrain themagnetic field strength in the ICM to be 1.8-3.5 $\mu$G. The position of 3CR403.1 in the magnetic field-gas density plane is consistent with the trendreported in the literature between central magnetic field and central gasdensity.

High frequency radio imaging of 3CR 403.1 with the Sardinia Radio Telescope