RB711.....

which is difference among the RBs:

711-2Hn / 711-2HnD / RB711UA-2Hn ?

Thanks

711-2Hn - 2Ghz 1chain
711-2HnD - 2Ghz 2chains
711UA-2HnD - 2Ghz with usb, more memory, 2 chains

http://wiki.mikrotik.com/wiki/Manual:Product_Naming

Ok thanks,

Does a Mikrotik product that contains the 711UA-2HnD and it has 2 spar exist?

What you mean: “2 spar” ?

sorry, 2 antenne…

http://routerboard.com/RB711UA-2HnD
http://routerboard.com/RB912UAG-2HPnD

it has two mmcx conectors. You can connect you own antenna…