Radio-loudness (R) vs. the radio spectral index (ανr) of PSO J0309+27 (red point) compared to RL AGNs discovered at z ≥ 5.5 (black squares) for which a measure of ανr in the literature is available. For PSO J0309+27, the value of ανr computed from the peak flux densities is shown. Light blue crosses represent the CLASS high-z (4 ≤ z ≤ 5.5) blazars. Among z ≥ 5.5 RL AGNs PSO J0309+27 has the highest R ever measured and it is the only one with a flat ανr.
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