https://www.instructables.com/Huawei-E220-external-antenna-7db/
Huawei E220 External Antenna +7db - Instructables
Huawei E220 External Antenna +7db: A quick and easy hack to boost the signal on a E220 modem. Parts required: Huawei E220 modem. Warrenty will be voided ;)...
huawei e220external antennainstructables