I have installed Tails on my MacBook Pro 2017 using Live Usb and the wifi signal is very weak. I purchased a WiFi dongle thinking that it might solve the issue but unfortunately it is the same case with WiFi dongle as well.
I have also tried installing drivers using:
apt-get install linux-headers-$(uname -r | sed ‘s,[^-]*-[^-]*-,,’) broadcom-sta-dkms
but no luck.
It is the same with Kali Linux using live usb.