50Kw is the limit, too, they aren’t allowed to go higher in power transmission :)
For AM, yes. “Clear channel” stations (not to be confused with Clear Channel Communications, the company). KTLK, Limbaugh’s new home in LA, is 50KW and reaches Phoenix at night. Guy upthread said he was going to a “minor station.” Proof one doesn’t need to know the first thing about something to talk about it (I do that myself sometimes so I can’t be too hard on him).