MMWCAS-RF-EVM: The problem of virtual antenna array

Part Number: MMWCAS-RF-EVM

1. I noticed a post on the forum saying that the 2243 cascaded panel vertical antenna virtual array is equivalent to 7 antennas. Why is that?

2. The 86 virtual antennas formed by the 9 horizontal antennas are calculated by the minimum redundant array or by beamforming and beam alignment?