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Accounting for ~20% of the total QSO population, Broad Absorption Line QSOsare still an unsolved problem in the AGN context. They present wide troughs inthe UV spectrum, due to material with velocities up to 0.2 c toward theobserver. The two models proposed in literature try to explain them as aparticular phase of the evolution of QSOs or as normal QSOs, but seen from aparticular line of sight.  We built a statistically complete sample of Radio-Loud BAL QSOs, and carriedout an observing campaign to piece together the whole spectrum in the cmwavelength domain, and highlight all the possible differences with respect to acomparison sample of Radio-Loud non-BAL QSOs. VLBI observations at high angularresolution have been performed, to study the pc-scale morphology of theseobjects. Finally, we tried to detect a possible dust component withobservations at mm-wavelengths.  Results do not seem to indicate a young age for all BAL QSOs. Instead avariety of orientations and morphologies have been found, constraining theoutflows foreseen by the orientation model to have different possible angleswith respect to the jet axis.

The central structure of Broad Absorption Line QSOs: observational characteristics in the cm-mm wavelength domain