I'd expect your router to connect to whichever 4G mast has the better metrics (using its internal antennas) and then depending where you're pointing the external antenna connect to that mast for its 5G.

Built with Balong 5000, the first multi-mode 5G chipset, HUAWEI 5G CPE Win supports both NSA and SA network modes 1 with super high speed.They do fluctuate so refreshing a few times and taking an average is probably better to eliminate an outlier value. Annoyingly since the first two days the maximum download speed is now around 20-30Mbs and driving close to the tower may increase it to 40Mbs. With that ID you should be able to find that on cellmapper providing your area has been suitably mapped by its users. So I wouldn't be better off getting another router and using a external 4G Antenna instead of the 5G one I have.

A 4G only router with an external antenna may give you better stability in terms of radio connection, but doing so would limit the maximum theoretical speed you'd get across that radio connection. AFAIK the Huawei CPE 5G Pro (H112-370/H112-372) only has external connectors for the 5G antennas, no 4G ones - the 4G antennas are internal only. This is less than I thought, less than a typical mobile phone so the chances of using it as a recharge point when not plugged in is small. If you want to REVIEW Your ISP then be aware that we use a separate member database and system for that ( Sign-up Here to Review).Looks like I will have to get up to the pole I have on the house and point at the other mast see what happens. Like in the same room next to the router, 99 Mb/s, 3 rooms on but with almost direct line of sight through windows, 1-15 Mb/s. Product pictures, videos and display contents on the foregoing pages are provided for reference only. The two antennas mentioned above actually have a lower gain than the Huawei one (assuming the stated 14dBi is accurate and in the critical 3500mhz range) and will likely do nothing for 4G at all (as the router doesn't have 4G external antenna connectors). If your Huawei products failed, you must contact your sales representative to verify product failure.