GM tnx 4 fast reply,
quality does mean imho not low loss ( e.g. if they would use RG-174) just that the manufactering process is of good quality.
I've searching a bit and found a Huawei the Q&A
Huawei Technical Forum: Which is my HSDPA stick E160 or E169 or ... that
Quote:
Q.: Which is my HSDPA stick E160 or E169 or E180 ?
A.: K3715 is not E160 ,E169 or E180.
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which contradicts some listings made on in the web.
PS.:
While it's good to have an antenna connector inside, I wonder if any of the matching female connector have been designed, similar to that used in Notebooks for WLAN, for more then just a a few disconnects. If I made up my mind and found a Stick I will have to buy/built an adapter-cable (e.g. SMA on the other side) and fix it permanently to the stick.
At a question for external use I found this info

Quote:
Specific Huawei aerial means a specific Huawei aerial only.
The connector is CRC9001-2401(SMK-3A).
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Huawei Technical Forum: E160X (model K3565) usb stick- aerial ...