Hello, Chas.
I'm unsure how many people here use an external antenna, but hopefully some one can confirm what they are using and tell you about their experience with it vs without it.
Three don't provide external antenna for the Hub, so it's not something that's referenced internally often. I think most places that are selling antenna would provide details on what they are best for. You'd be looking for something that covers the LTE and Sub-6 5G bands. For the higher speed bands, 5G is running on 3600mhz, with LTE running on 2100mhz, and 1800mhz.
Pete.
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