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Ta! What would be the advantage of that, over something like this?
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Number of aerials does not mean it's got a better reception. And frankly the quality of Wi-Fi in my opinion isn't just the software that controls the frequency selection and power, but it's the stability of the software over a long period of time, i.e. the allocation of devices connected and the MAC table. Cheaper modems typically require rebooting periodically because their software is pretty buggy, so my focus on Wi-Fi equipment is "Will it run for years and be able to be forgotten about and just work?"... for Ubiquiti stuff that answer is yes.
If you're keeping their modem and just want a Wi-Fi thing only... then an Ubiquiti Access Point like https://www.ui.com/unifi/unifi-ap-ac-lite/