In this letter, we report the discovery of the highest redshift, heavily
obscured, radio-loud QSO candidate selected using JWST NIRCam/MIRI, mid-IR,
sub-mm, and radio imaging in the COSMOS-Web field. Using multi-frequency radio
observations and mid-IR photometry, we identify a powerful, radio-loud (RL),
growing supermassive black hole (SMBH) with significant spectral steepening of
the radio SED (f1.32GHzββΌ2 mJy, q24ΞΌmβ=β1.1,
Ξ±1.32β3GHzβ=β1.2, ΞΞ±=β0.4). In conjunction
with ALMA, deep ground-based observations, ancillary space-based data, and the
unprecedented resolution and sensitivity of JWST, we find no evidence of QSO
contribution to the UV/optical/NIR data and thus infer heavy amounts of
obscuration (NHβ>1023 cmβ2). Using the wealth of deep UV
to sub-mm photometric data, we report a singular solution photo-z of
zphotβ = 7.65β0.3+0.4β and estimate an extremely massive
host-galaxy (logMββ=11.92Β±0.06Mββ). This
source represents the furthest known obscured RL QSO candidate, and its level
of obscuration aligns with the most representative but observationally scarce
population of QSOs at these epochs.Comment: Submitted to ApJL, Comments welcom