01/22 You can’t have two stations close together
This is why the United States can have nearly 5,000 AM radio stations on only 117 different frequencies. The good news is that since the signals of stations tend to be limited in their range, you can use some of the frequencies many times as long as the stations are far enough apart geographically. So these are the first things that limit the number of am fm radio headphones stations in an area. And for the same reason you can’t have two stations close together in frequency in the same area. They will interfere with each other. This means numerous stations can be put on the same frequency that are too close together in a geographic area.