Mantbox ax 15

I facing problem with my two Mantbox ax 15s on wifi 2 to transmit signal 8 km line of sight to SXTsq ax.

Both Mantbox have the came SSID and SXtsq ax same SSID

The country is set to United States.

All is set on default: Tx chain, Tx power, antenna gain, distance, manger, beacon interval, DTIM period, Multicast enhance, QoS classifier.

Is there another configuration I need to do, if yes please help.

From the documentation in regards to distance:

Maximum link distance in kilometers, needs to be set for long-range outdoor links. The value should reflect the distance to the AP or station that is furthest from the device. Unconfigured value allows usage of 2 km links.

Is this wireless network in the United States?

There you go! Default distance is 2km.