  In this work we review an effective description of the interaction of a gauge
field with a tower of massive vector fields by introducing a non-diagonal mass
matrix in a gauge invariant way. Particular cases of the method with only one
vector resonance have been used by the author elsewhere, nevertheless in this
paper the method is developed in a general way and and we proof its main
features for an arbitrary number of vector resonances. Additionally, we show
how to couple the vector resonances with fermions. We find that the method can
be useful in order to describe the low energy phenomenology of scenarios like
Kaluza-Klein resonances of usual gauge bosons or Technicolor vector resonances
and detailed examples are provided.
