hello
I apologize for my bad english.
I am writing with google translation.
diagram of the system is running?
How can the results estimated speed?
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maybe 120-150mbit at a guess - wireless could intefere with each other if very close (Cross talk), and packets arriving out of order for bonding may cause performance issues. Matter of trial and error.
With 2 x 2 SXT and bonding I had ~250mbps TCP. I used RB750GL.
http://wiki.ubnt.com/Mikrotik_bonding used but with old SXT not SXT Lite.