Am not sure this will work ( i dont have my ant yet)

but my plan is ( it may help you )

I have an old router, that I shall set to 192.168.2.1 (or whatever)

connect my PC by dhcp and the ant to my old router.

Make the necessary changes in the ant for my normal network with a static IP ( all my gear has static IP's so i know where they are).

reconnect PC and Ant to my home network.