  We will consider the high frequency behaviour of distorted plane waves on
manifolds of nonpositive curvature which are Euclidean or hyperbolic near
infinity, under the assumption that the curvature is negative close to the
trapped set of the geodesic flow and that the topological pressure associated
to half the unstable Jacobian is negative.
  We obtain a precise expression for distorted plane waves in the high
frequency limit, similar to the one in \cite{GN} in the case of convex
co-compact manifolds. In particular, we will show $L_{loc}^\infty$ bounds on
distorted plane waves that are uniform with frequency. We will also show that
the real part of distorted plane waves restricted to a compact set satisfy the
analogue of Yau's conjecture about the Haussdorff measure of nodal sets.
