  This paper studies the delocalized regime of an ultrametric random operator
whose independent entries have variances decaying in a suitable hierarchical
metric on $\mathbb{N}$. When the decay-rate of the off-diagonal variances is
sufficiently slow, we prove that the spectral measures are uniformly
$\theta$-H\"{o}lder continuous for all $\theta \in (0,1)$. In finite volumes,
we prove that the corresponding ultrametric random matrices have completely
extended eigenfunctions and that the local eigenvalue statistics converge in
the Wigner-Dyson-Mehta universality class.
