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There are definitely international agreements and institutions in place to regulate and help avoid this exact situation. The ITU-R sets the rules and encourages int'l coordination between countries on spectrum. Borders are a big concern. I'm guessing the Mexican gov't didn't prioritize enforcement, and that they'd be getting diplomatic pressure from the US if the transmitter interfered with an existing US station (esp. if in a major market).

As an example if you are coordinating a new licensed fcc part 101, point to point 6 or 11 GHz link near the Canadian border, it requires analysis of the field strength as received by existing licensed links in Canada. Both the FCC ULS data and IC TAFL are used by private coordinators for this purpose. The same also applies the other way around.

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