Why can't they find these illegal stingrays with the following technique: Install a small network node at each legitimate tower that can only be seen on that t

Why can't they find these illegal stingrays with the following technique: Install a small network node at each legitimate tower that can only be seen on that tower but is always accessed the same way in secret. Only a receiver on that tower can connect to that network segment (similar to how I can connect to computers on my lan, but the firewall prevents others from doing the same outside of it. This will identify positives. We can ignore that in the site survey. Then after a dc wide survey has been complete we can identify all the towers that don't have this official network identifier, triangulate them using known techniques and then shut them down or prosecute?