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Size of “donut” signal waveform emitted from AX86U Pro antennas?

SkippyP

Regular Contributor
I have an AX86U Pro located on the main floor of my house. I have a basement and upper floor. I understand that the signal is broadcast perpendicular to the antennas (i.e. if antenna is vertical, signal radiates out horizontally) in a donut-like shape. Thus, I also understand that it’s generally recommended to keep the middle antenna positioned vertically and the two outer antennas at 45 degree angles (with all three antennas forming a W shape) in order to maximize coverage in a multi-floor home.

Having said that, does anyone know why I get better signal strength and better throughput all over the house with all three antennas oriented vertically instead of the W pattern? How large is the width of the “donut” signal waveform? Put another way, how “thick” would the donut be? I’d imagine it can’t be shallow since I’m getting full WiFi bars and strong signal on all devices on all three floors with all three antennas positioned vertically. The donut-shaped signal would need to be fairly thick/wide to stretch and cover upper and basement floors, right?
 
Because the Asus instructions for this router are to have the antenna vertical...
EDIT. There is also a fourth antenna inside the case.
 

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