My RB751 has a full country list for wifi bands. I’ve always used United States but see US 2 and 3 listed along with some other US ranges.
I have not seen what US 2 or 3 cover and in light of the FCC’s $200,000 fine to TP Link for allowing Americans to use
illegal power levels was wondering if Mikrotik is FCC compliant.
https://apps.fcc.gov/edocs_public/attachmatch/DOC-340564A1.pdf
“The Commission’s Office of Engineering Technology (OET) investigated a Wi-Fi router
marketed in the U.S. by TP-Link, and determined that TP-Link’s software installed on the router included
a user setting that violated Section 15.15(b) by permitting the user to change the country code for the
router, thereby enabling the router to operate at a higher power than allowed on certain restricted Wi-Fi
channels, in violation of the Rules.”