T}$ does not depend on frequency. This together with non-vanishing antenna pattern function along the detector’s arm for the scalar longitudinal mode leads to the preferable detection feasibility at high frequencies for that mode. The reason for this is simple: the spacetime trajectory of the light ray lies on the $3$–dimensional hypersurface of the constant phase of the passing plane gravitational wave therefore photons perceive it as a constant field. The same is true for ${\rm v}<1$ but in this case planes of the constant phases of the gravitational wave are no longer tangent to null cones of the light rays. When ${\rm v}<1$ the light cone formed by light rays emitted from ${\bf x}_{E}$ and the plane of the constant phase passing through ${\bf x}_{E}$ intersect and the null lines of the intersection determine a set of null trajectories that satisfy ${{\boldsymbol \Omega}}\cdot{\bf n}_{ED}={\rm v}$, see Fig.\[f:TT2b\]. For ${\rm v}>1$ light cones and planes of the constant phases do not intersect and the effect does not arise.

Interestingly for ${\rm v}<1$ the direction of the maximum has non-vanishing components parallel and orthogonal to ${\bf n}_{ED}$ thus one expects that all polarization modes of gravitational waves, transversal and longitudinal, will 