  We consider the most general Kaluza-Klein (KK) compactification on
$S^1/\mathbb{Z}_2$ of a five dimensional ($5D$) graviton-dilaton system, with a
non-vanishing dilaton background varying linearly along the fifth dimension. We
show that this background produces a Higgs mechanism for the KK vector coming
from the $5D$ metric, which becomes massive by absorbing the string frame
radion. The $\mathcal{N}=2$ minimal supersymmetric extension of this model,
recently built as the holographic dual of Little String Theory, is then
re-investigated. An analogous mechanism can be considered for the $4D$ vector
coming from the (universal) $5D$ Kalb-Ramond two-form. Packaging the two
massive vectors into a spin-$3/2$ massive multiplet, it is shown that the
massless spectrum arranges into a $\mathcal{N}=1$, $D=4$ supersymmetric theory.
This projection is compatible with an orbifold which preserves half of the
original supersymmetries already preserved by the background. The description
of the partial breaking $\mathcal{N}=2\rightarrow\mathcal{N}=1$ in this
framework, with only vector multiplets and no hypermultiplets, remains an
interesting open question which deserves further investigation.
