  This paper discusses the geometrical features and wideband performance of the
beam with maximal ratio combining coefficients for a generic multi-antenna
receiver. In particular, in case the channel is a linear combination of plane
waves, we show that such a beam can be decomposed in a linear combination of
beams pointed in the direction of each plane wave, and we compute how many
directions can be effectively utilized. This highlights that such beam is
better exploiting the spatial diversity provided by the channel, and therefore
it is expected to be more robust to disruptions. Moreover, we compute the
achieved Signal-to-Noise-Ratio for a wideband receiver, showing that it is not
significantly worse than for other methods. Finally, we provide some insights
on the robustness of the method by simulating the impact of the blockage of one
multipath components.
