Comment by soulofmischief

There are power regulations. You can't simply broadcast a more powerful signal. And that also only makes the problem worse for everyone else, it immediately turns into a room of people shouting over each other and nothing actually being communicated.

And you cannot simply switch bands, because amateur bands are very specific.

You're left with attempting some form of recoverable signal modulation which can propagate through the problem area, but it becomes akin to making ripples in a turbulent river. The ripples simply do not contain the energy to resist diffusion of the surrounding heat in the environment for any considerable length of time. We definitely have techniques for propagating multiple signals across the same frequency band, it's fundamental to modern communication, but it still comes with physical limitations.