  A model for a Regge trajectory compatible with the threshold behavior
required by unitarity and asymptotics in agreement with Mandelstam analyticity
is analyzed and confronted with the experimental data on the spectrum of the
$\rho$ trajectory as well as those on the $\pi^- p\to \pi^0 n$ charge-exchange
reaction. The fitted trajectory deviates considerably from a linear one both in
the space-like and time-like regions, matching nicely between the two.
