For 8$ including shipping, it is little surprise that this antenna does not fulfill its exaggerated promise. Still, it is an extremely cheap option to get the network signal from the outside to the inside of a room.
Getting the Huawei E3372 LTE dongle to work on a router with OpenWRT 15.05 Chaos Calmer is very easy and requires two additional packages:
usb-modeswitch. They can either be installed through the web interface (System > Software) or by running the following on the command line:
New projects page with a list of personal projects added.