I've found that's the power a little better, if you set the port speed to be used only the external antenna. In the setting combination of the self-antenna Speedport with external antenna the downstream is less.
We have it as stable as possible tried to grow, but in a storm the antenna already is shaking a little. Hopefully it survived a major hurricane.
The orientation of the antenna, with us in the direction 19 ° north-northeast is a little fiddly job. With us, the antenna is also aligned roughly in the direction as we had no instrument at hand. A professional gets the safe even better now and can tease out one or two Mbit from the antenna. But us it is enough that way.
Note: LTE and LTE antennas are largely unknown among the population. Especially in the older sections of the public every day of the TV with an NSA and BND wiretapping scandal after another be confronted. So do not be surprised if you will a little funny watched or approached the first time.
In our case, the antenna needed towards a settlement to align what the uncertainty in the neighborhood has certainly increased slightly.