  Is there a constant $r_0$ such that, in any invariant tree network linking
rate-$1$ Poisson points in the plane, the mean within-network distance between
points at Euclidean distance $r$ is infinite for $r > r_0$? We prove a slightly
weaker result. This is a continuum analog of a result of Benjamini et al (2001)
on invariant spanning trees of the integer lattice.
