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In this situation, we strongly advise you to contact the PC manufacturer, or the place where you purchased the wireless adapter.
We would like to mention that the end user is not authorized to install Intel® wireless adapters. They can only be installed by the PC manufacturer or its authorized representative.
Using a single antenna may cause interference when using Bluetooth/Wi-Fi, but will also limit the connection since both antennas are used by Wi-Fi to increase the amount of spatial streams.
For more information about Spatial Streams, data rates and MIMO, please review the following documents: