Simple quick question -
The screenshot below of a C927- LTE version - and as you can see items 1 and 11 are Antennas.

Does anyone know, if at all, if there is a 'master' / 'slave' or more 'Primary / Secondary' ?
Or basically - what is the working when using two aerials ?
For our issue - we have the small local one, and an extension lead with an aerial on the roof of the building.
Do the aerials work in tandem ? or what ? as we seem to be getting 'varied' signalling speeds.
Because if you look closely - the 'markings' under the port (11) are more than the one under port (1)
and 
Could this be an indication of Primary ? Secondary ?
TIA.