No, it’s a practical advice. You can leave the antennas in their positions temporarily, but prepare for moving them to the recommended places in the near future. The Wifi 6 card tries to do beamforming and MIMO, and for these to work correctly, it is needed to have the antennas as far from each other as possible (this is a bit of handwaving argument as I don’t understand the underlying physics very well, but you can try imagining it purely geometrically: if you try to beamform the transmission for a client, you basically create a triangle between two antennas and the client; the closer the antennas are to each other, the sharper the angle of the client’s triangle vertex, and thus it requires much more precise control of the beamform - even a very slight delay at one of the antennas would result in a very different client vertex position).
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