Cannot get throughput above 1106kb at -71

Hi Guys

I cannot for the life off me get a particular link to operate properly. Please see attachement

Signal Strength : -71
CCQ : 52/62
P-throughput : 1106
Data Rate : 9mbps
SNR : 50
Nstreme has not effect.

I am using a dual polarised dish connected to 2x radios.

wlan1 channel: 5180 using 802.11a
wlan2 channel: 5320 using 802.11n

Each on a different polarity.

Since both links are not functioning properly, I am thinking that the problem is with the antenna.

Your thoughts?

Thanks
badlink.jpg

What happens to the CCQ when you disable one of the links?