And when certain atmospheric conditions exist.

Except this discussion is about possible interference across town, or even more locally.

No need for "certain atmospheric conditions".

The point was that very low power signals can go a long, long way.

You explicitly brought up long distance communication in this thread:

> And even a few micro-watts is sufficient to communicate across town.

> Many years ago the record was "1000 miles per milliwatt" using CW.

Except that both can be true. A few millwats can reach across town, or across the world. The original claim was that "weak signals don't go very far", or some such.

They also do it with very simple transmitters using perhaps just one transistor. All it takes is a few mill-watts and a reasonably efficient antenna.