That’s the question. I am not sure who from the Nabu Casa HA team would know the answer about how to enable the CM4’s External Antenna feature. @agners possibly?
Not sure why it would be any different.
Well the external antenna is first and foremost out of the case, which is generally an improvement. Secondly, on paper at least, it should have longer range compared to the one on the board.
The Raspberry Pi Operating System is a customized, purpose-built OS for the Raspberry Pi hardware. Thus, it contains features and options that not all Linux distributions have built into them. I am not an expert on HAOS for Raspberry Pi, and thus the question regarding whether or not it has built-in support for enabling the CM4’s External Antenna feature. I am hoping one of the HAOS devs, like @agners, can comment on this particular feature for the Yellow edition of HAOS.
Yes I’ve had to edit config.txt to enable USB 2.0 on the CM4. For some reason it’s disabled by default. I use this addon to configure root access via SSH on port 2222.
If anyone needs it. To enable USB 2.0 Host Mode I added the following to /boot/config.txt. Without this my zigbee stick was not recognised.
dtoverlay=dwc2,dr_mode=host
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You are using the generic RPi image then (I did too initially - USB being disabled by default is a CM4 thing). The custom Yellow image has USB enabled out of the box.
I make an add-on specifically to enable USB-Host-mode Serial as well. 🆕[add-on] HassOS Serial Configurator
Yes I know that, but I was asking why the it would be any different modifying config.txt. I know an external antenna should act differently to a PCB one.
Any raspberry pi OS has config.txt.
Ok ok, I seem to have misunderstood the question. It’s because the CM4 has been designed to only use the built in antenna on the board, unless specified differently. And as far as I know this only applies to the CM4. But as @ogiewon already stated, I’m not sure if this actually translates/works with HAOS. Here you have a blog post from Jeff Geerling that explains the process:
Check out this site. That’s how I got mine quickly: https://rpilocator.com
Filter by CM4 and your region.
I got mine now and just migrated from my Raspi 4. It was completely painless due to this wonderful tutorial by Lewis: Getting Started With Home Assistant Yellow! - YouTube.
Highly recommend his channel in any case.
Yes that is my setup, however no time yet to test. I recommend getting a (or a few if you have a larger home) ESP32s and set them up as BT proxies: ESPHome Bluetooth Proxy That is my next to do.
Yes that would have been nice, but it doesn’t work for me. I generally only need BT for my Mi Flora sensors and they unfortunately do not play nice together with the proxies. I’ve tried different ESP32s with different proxy settings, but eventually they just turn unavailable. They work perfectly with my BT dongle. 
How did you configure the CM4 to use the external antenna? Did you edit the config file? And what’s roughly the range of the antenna in your home?
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Yes, I know. But the Mi Flora component does not support the battery sensor, since it’s passive. The battery sensor requires active BT communication.
Or the older firmware 
There are posts claiming otherwise, perhaps post an issue if it is not working for you.