  We discuss the specificity of searches for hypothetical $W^{\prime}$,
$Z^{\prime}$ and $\gamma^{\prime}$ bosons at hadron colliders in single top
quark and $\mu^{+}\nu_{\mu}$ production and Drell-Yan processes assuming these
particles to be the Kaluza-Klein excitations of the gauge bosons of the
Standard Model. In this case any process mediated by $W$ is also mediated by
the whole KK tower of its excitations, whereas to the processes mediated by $Z$
and $\gamma$ there is not only a contribution from their KK towers, but also
from that of the graviton. The contributions of the towers above $W^{\prime}$,
$Z^{\prime}$ and $\gamma^{\prime}$ and above the first excitation of the
graviton are included with the help of effective four-fermion Lagrangians. We
compute the cross-sections of these processes taking into account the
contributions of the Standard Model gauge bosons, of their first KK modes and
of the corresponding KK towers and discuss the impact of the interference
between them. For pp-collisions at the LHC with the center of mass energy 14
TeV we found specific changes of the distribution tails due to the interference
effects. Such a modification of distribution tails is characteristic for the
processes mediated by particles coming from extra dimensions and should always
be taken into account when looking for them.
