Once you stray out of 2.4GHz there are a lot of restrictions on wireless communication. In many countries, I would even suspect the US, there are restrictions on which 5GHz channels are allowed to be used outside, how certain channels may be used even indoors etc. usually your consumer router/AP handles this for you but if you purchase an item in a different jurisdiction and then travel with it you may in reality not be compliant with local laws even with wifi.

Satellite/UHF etc has even more restrictions.

Disclaimer there is actually limits on 2.4GHz as well but I’m generally referring to wifi where the conventional channels are pretty universal