I managed to snap the cable that connects one of the two antenna to the main board. I am unable to find a replacement part, there are antenna that have the SMA connections are not what this uses as it's a snap in part that has a cable running to the main board itself. I figured I might just solder in a bit of extra cabling but after looking at the cable itself and the sleeving, I assume it's not going to work the way I hoped.
You need an antenna with a pigtail and a PCB connector. loosely this kind:
https://www.amazon.it/Greluma-Antenna-maschio-wireless-Ripetitore
If you check here:
https://confusedbird.com/thread-119.html
you will find people that replace or add antennas to the Chateau (vartious models) and you can probably find more details.