On a detector that works by monitoring the distance between two free flying masses, forFor a wave of the form, say, $$ ds^2 = -dt^2 + [1 - A\sin(\omega(t-z))]dx^2 + [1 + A\sin(\omega(t-z))]dy^2 + dz^2$$
how should one orient the detector (that works by monitoring the distance between two free flying masses) to register the largest possible response?