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If you want to get really, really spicy, use three devices/antennas and you can roughly track in three-dimensional space.

Wouldn’t three dimensional tracking need four antennas?

Three appropriately spaced antennas will give you azimuth and elevation of a ray to the transmitter, but not distance.

But using two of the above in different, known locations would allow you to compute the intersection to a 3D location.

there are wifi setups that allow you to do this already.

I would like to subscribe to this API.