Huawei E160X (Vodafone K3565) 3G dongle external antenna / casing

Step 10 Drill a hole for the SMA connector

A 5mm hole drilled 9.5mm away from the side of the enclosure will help lock the hexagonal connector against the side of the enclosure, preventing the pigtail connector rotating when the external antenna connector is screwed / unscrewed. It's up to you whether this connector is mounted on the opposite side of the enclosure to the USB connector or on the same side.