Hi @Basiony89, welcome to Three Community 😊
We don't disable antenna ports, or place any specific restrictions on their use with our routers, and we have heard from customers using external antennas successfully. However, we don't supply or test them with our network.
Are you having any trouble with your 5G router? Let us know about that if so, and we'll see if there's anything else we can do to help.
StephR
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