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.