Customer has low SNR level issues with MESH 5GHz .11a network on the field with RFS6K and APP7131 when using primary antenna only option. The distance between BB and CB MESH is around 100 m.   I won't tell you more about the environment... as we are able to replicate the issue in a clean closed office environment by using  RFS4000 and AAP7131 with 4.3.4.0-014R sw. The antenna we are using is ML-2452-APA2-01. The issue is a very very high -89 dBM noise level and that happens on every channel we have tried 56, 100, 120 ,,,    When using full 3 antenna MIMO the Noise level is 40 dBm lover, so I´m pretty sure that this issue is related to the PRIMARY only antenna option. According to specs it should be doable,. The question is: Has anybody succeeded to build up a same kind of 5GHz MESH by using the primary antenna option only? -markus-