Anything that transmits a signal can be found, just get that out of the way immediately. The only way to be 100% untraceable is to never transmit.

Mesh networks, however, are pretty safe. Triangulation the origin of a mesh transmission will just lead to the repeater node which, admittedly is a pain in the dick if they kill the repeater and the network goes dark, but it doesn’t lead directly back to a person, just a box they stuck on a cell tower or up on a hill somewhere.