Let me just add that if you want "free" broadcasting, there are areas of the spectrum designated specifically for that. You can buy a CB radio set and use it with no license or fee whatsoever. By passing an exam you can acquire a license as an amateur ham radio operator, allowing you to use many designated regions of the radio spectrum; although there are generally rules of etiquette and politeness involved in such usage.
In addition, you can set up your own low-power AM or FM radio station and operate it completely unlicensed, in accordance with
Part 15.
One thing you'll notice, for example with CB radio, is that if too many people are on the same channel it can be quite confusing. This is a mild example of the "radio pollution" I mentioned earlier, and it's why the majority of the broadcast spectrum is regulated.