  Motivated by the description of the C*-algebra of the affine automorphism
group $N_{6,28}$ of the Siegel upper half-plane of degree 2 as an algebra of
operator fields defined over the unitary dual $\widehat{N_{6,28}}$ of the
group, we introduce a family of C*-algebras, which we call almost
$C_0(\mathcal{K})$, and we show that the C*-algebra of the group $N_{6,28}$
belongs to this class.
