I got these.That's unfortunate as the b818 is 4x4 mimo and using an antenna downgrades it to 2x2 possibly significantly affecting speeds.. What speed do you get if you keep it outside the window for example?
Re pigtails, yes get those, the ts9 sockets are very close to each other and the simple adapters are too thick, will make contact and short themselves.
You're right Lucian, they're VERY close. I don't think they made contact but I filed flat edges to the knurled parts and aligned them in the B818 just to be sure.
I have repeatedly tested the router with and without antenna, with the router sited close to where the antenna is stuck to the window. Every time the signal strength shows an improvement when using the internal antennae, but signal quality is a bit better with the external, as is internet speed.
In my case therefore, 4xMIMO has no noticable advantage.