  This letter considers the wavenumber-division-multiplexing (WDM) scheme that
was recently proposed in [1] for line-of-sight communications between parallel
(side-by-side) spatially-continuous electromagnetic segments. Our aim is to
analyze the performance of WDM, combined with different digital processing
architectures, when the electromagnetic segments have an arbitrary orientation
and position. To this end, we first show how the general electromagnetic MIMO
(multiple-input multiple-output) model from [1] can be particularized to the
case of interest and then use numerical results to evaluate the impact of
geometric parameters (e.g., horizontal and vertical distances, azimuth and
elevation orientations). It turns out that WDM performs satisfactorily also
when the transmit and receive segments are not in boresight direction of each
other.
