I think this helps explains why its so good…
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This means the further apart the antennas are - precission increases?
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Does anyone use Dual around trees? Seems like an IMU would still be handy in those cases.
Also, it still seems bizarre to me that adding another device that deems its position from space & corrections can make a system MORE accurate than fusing with a device that is meant for pitch/roll and is 100& local to the machine.
Not saying Dual isn’t better because I haven’t tried it, but just thoughts 
Almost all my fields have woodland/forest borders.
So outside run on each field there’s heavy shading from trees, I’ve had no problems at all, it was the thing I was most concerned about.
I’m using the white survey type antennaes.
Imus all suffer from drift, interference and vibrations. Hence needing to fuse with GPS.
The only standalone IMU that will beat dual antennae is a Fibre optic gyroscope, but one will cost more than a new tractor!
I can try and drive under some tree canopy and see at one point I loose dual.
The tractor I posted a video of started as a single antenna with IMU. After a year and a half I went dual. Tuning is easier to get it to perform well. With a single antenna I could never completely tune out a faint weave of the front end as it tried to find the line. With dual the weave is gone, the tractor gets on line and runs arrow straight across the field
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