Hi,
I haven't tried 2.4GHz because of the interference pointed out by others, so I use the 5GHz WiFi built in the Pi4. It is around 50' with the Pi strapped to the fork arm of the telescope, and I've not had a dropped connection. There are at least 20 networks visible in this suburban location. The Pi case is plastic on the bottom, which may help. You might try 5GHz to test it, unless you have to run 2.4GHz.
Dave
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