Hi
Im wondering If i install another minipci-E LTE module like ec25 on LtAP LTE kit , Do I need extra LTE antena ? I didn't purchase Ltap lte kit yet

Each LTE modem needs its own set of antennas (the EC-25 and the R11e-LTE(6) use two antennas each, some other models use 4 or even more if they support 5G). You can use only the main antenna at each modem card, but the performance is worse.