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The object 4C 71.07 is a high-redshift blazar whose spectral energydistribution shows a prominent big blue bump and a strong Compton dominance. Wepresent the results of a two-year multiwavelength campaign led by the WholeEarth Blazar Telescope (WEBT) to study both the quasar core and the beamed jetof this source. The WEBT data are complemented by ultraviolet and X-ray datafrom Swift, and by gamma-ray data by Fermi. The big blue bump is modelled byusing optical and near-infrared mean spectra obtained during the campaign,together with optical and ultraviolet quasar templates. We give prescriptionsto correct the source photometry in the various bands for the thermalcontribution, in order to derive the non-thermal jet flux. The role of theintergalactic medium absorption is analysed in both the ultraviolet and X-raybands. We provide opacity values to deabsorb ultraviolet data, and derive abest-guess value for the hydrogen column density through the analysis of X-rayspectra. We estimate the disc and jet bolometric luminosities, accretion rate,and black hole mass. Light curves do not show persistent correlations amongflux changes at different frequencies. We study the polarimetric behaviour andfind no correlation between polarisation degree and flux, even when correctingfor the dilution effect of the big blue bump. Similarly, wide rotations of theelectric vector polarisation angle do not seem to be connected with the sourceactivity.

The beamed jet and quasar core of the distant blazar 4C 71.07