You’re welcome. Actually the MKT terminology is very misleading here.
There are frequencies that only can be used “indoor” (by FCC , ETSI regulation etc)
There are frequencies that are allowed to be used “outdoor” (by FCC , ETSI regulation etc) [there is no “only” in this statement]
MKT:
indoor= use only indoor frequencies
outdoor= use only outdoor frequencies
any= use both
Legal interpretation
outdoor = do not use frequencies that are indoor only (because they cause problems for emergency services and other priority owning groups when used outdoor)
indoor= use any frequency as it is contained indoors
In Europe (etsi) many have a poor wifi experience indoors, because they set the MKT on “indoor”. Missing out the less used and 7 dBm stronger outdoor frequencies.
(There is no TXpower limit difference in ‘united states3’ between indoor and outdoor)