Interesting that you had to get a license.
Why is that interesting? The airwaves are regulated by the Federal Communications Commission, and talking on Amateur Radio requires one pass a test to receive a license.
There are three license classes available, they are Technician(entry level), General Class and Advanced Class. Each license class opens up different bands (frequencies) for the operator to use.
I'm currently a General Class, I'll be taking my Advanced Class license test in the next few weeks. You may be surprised how many Hams there are here on Free Republic.