[Discuss-gnuradio] What is the maximum number of multiple antennas at a transmitter?

Hi all,

We are using USRP1 and 2 WBX d'boards to implement a transmitter with two antennas.

Since the two d'boards are synchronized, it was easy to implement.

Now we're planning to implement a system with more than 2 transmit antennas.

Is it possible to have more than 2 transmit antennas with USRP1?

Or, is it possible with other new USRP hardwares (e.g., USRP-N210, USRP-E100, or USRP2)?

Thanks!

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Minsuk Kang