French Fox News? Audience-level metrics for the comparative study of news audience hyperpartisanship

French news channel CNEWS is regularly compared to Fox News due to presumed ties with the far right, and for promoting conspiracy theories and partisan propaganda. Using data from the ReCitCom project, I propose simple metrics for quantifying the partisanship of news audiences cross-nationally and identifying channels like Fox News in other media systems. I apply them to France and find that CNEWS has the most ideologically radical news audience within the French media ecosystem, and that the pattern is more pronounced with higher frequency of use. Comparatively, I show that the Fox News and CNEWS audiences have an equivalent ideological lean that justifies the comparison between the two outlets at the audience level. The two audiences are also disproportionately receptive to far-right candidates compared to other news audiences and their respective national samples.