Has this dutch company just discovered single antenna beam forming?
Without knowing anything about antenna design, I'd still suggest that a funny shaped antenna would still appear to any receiver practically indistinguishable to a uniformally circular antenna, either in signal strength or deviation.
When you have two antennas, the signal strength sums (evenly) when you are equidistant from each antenna. If you aren't directly between them, you still end up with massive benefits of multipath and funky calculations increase the robustness of your signal reception ability.
If you have more than two, you get much better reception, but the processing gets harder.