  The couplings of unflavored vector mesons to the $e^+e^-$ annihilation are an
important source of information on the nature and structure of these resonances
which play a prominent role in the hadron phenomenology. The couplings of many
radially excited heavy vector mesons are measured, while the corresponding
couplings for light vector mesons are not known. We propose a phenomenological
method allowing to estimate these unknown couplings. The method is suggested by
our observation that the electromagnetic coupling of the $n$-th radial
excitation of $S$-wave heavy vector meson decouples from the $e^+e^-$
annihilation with nearly exponential rate with $n$. It becomes natural to
assume that the same effect takes place in the light vector mesons and this
would allow to estimate the unknown couplings. We tested this assumption with
the help of a generalized version of borelized QCD spectral sum rules saturated
by a linear radial trajectory of meson states taken from the phenomenology.
This leads to a consistent setup which is able to predict the decoupling rate.
The calculated rate turned out to be almost the same as in the heavy vector
mesons. Our result may be interpreted as an effective account for non-trivial
electromagnetic formfactor in meson decays to $e^+e^-$, thus looking beyond the
large-$N_c$ limit. On the one hand, we argue that the given decoupling does not
necessary contradict to the previous large-$N_c$ results for the Regge like
meson spectra.
