PTP 820c - Possible to add another link using the same antenna to double throughput?

I read a comment somewhere someone claiming this is possible. Im wondering if its true. I am trying to find a solution to increase capacity on a 10mile link. We are tapping on 1gb currently on this tower and are going to upgrade to a 650mb license to buy some time.

check our 4x4 MIMO, using same channel and double the throughput.