Lets say you have a wilderness area. No matrix signals.
Now, lets say you make a line of technomancers from the nearest area with matrix reception, to that place in the wilderness.
Am I right in thinking that you get an area of matrix accessible only to other Technomancers, since there are only biological nodes there ?

Since they must be actively communicating for the biomatrix to be active, I'm thinking that if you successfuly detect one of them, you can access the
network.

Mundane hackers could maybe intefere with the traffic, but couldn't connect to the matrix themselves within that wilderness area, as there's no node
within range they can recognize.

Now that I think about it, it doesn't have to be a wildreness. Set up a wifi blocking, long corridor. Station technomancers along the way, and at the other end
you could have a technomancer haven of some sort. Unless i'm missing something.

I've also wondered if technomancers can cluster their own biological nodes or not...

Aren't technomancers a bit too rare to be used as mesh tags?

In any case, it'd probably work... if all the TMs trust each other enough to leave their biological nodes open to each other's wireless traffic. I imagine Dissonants and free sprites might find this a highly tempting target for mischief, though.