Backhaul Frequency Re-Use

With proper vertical seperation, is it possible to re-use a frequency on a 20 Mbps backhaul link, which is 180 degrees behind the other link? Basically the exact same design that is recommended for an AP cluster, but with two backhaul links.

Has anyone attempted this?

Yes, but you need a CMM to synchronize the two. Motorola recommends the same frequency/sector/compass-direction pattern for both AP clusters and co-located BHs.