What is this forum site all about?
The answer is easy, it is all about building, owning and operating your own low power radio station, license-free and legally.
The forum name "Part15.us" refers to FCC Rules Part 15 in which the section on "Intentional Radiators" describes permitted power levels and technical standards for operating on most radio bands including long-wave, medium-wave (AM), shortwave, FM, and even Wi-Fi computer devices that broadcast at low power.
Probably thousands of such low power radio stations operate throughout the states as hobbies or businesses.
Members of this forum talk about technical and programming issues involved and the surrounding public enjoys the novel programming receivable on standard radios.
Are there any questions?
I think you hit the nail on the head.