nstream-dual with dual pol antenna

I am testing v3rc5 nstream-dual with dual pol antenna from mti (MT-485025) but using far away channels i don’t have good results.
The system was working ok into the lab but at 10km it is working very bad with low throughput and very fluctuating latency.

Anyone has tested this antenna with nstream dual in real field?

Regards
Ros

Search forum. Someone already initiated the same topic.