I'd say anywhere on public property, filming is covered under the first amendment, since KBOI is in the United States, you're protected under the constitution, thus the "authorities" are not a factor.
If anyone says anything, just tell them you're exercising your 1 st amendment rights, any American will understand and respect that, if the person gives you any grief just ignore them and carry on, they are probably just a communist who hates feeedom and are not worth your time.