Here's a little mnore history about how a corporate radio group tried to kill AIr America by airing it, for a short time.
When Clear Channel added Air America to am 1530 in Cincinnati about 4 years ago, the people behind the scenes were openly hostile about the programming that didn't echo the Republican party line that they promoted on 50kw WLW and their other stations. After less than a year on a signal with not such a good local coverage but a great nighttime skywave, they pulled the Air America programming and declared that the format was not viable. Same thing in Columbus on a local am station with a relatively weak signal.
They did little, if any, off-air promotion, gave it little time to develop an audience, and put no effort into it, or identifying with the listeners who enjoyed the format by offering events and interactions with the hosts and getting involved with things that reflect the progressive values of the audience.
So when it's suggested that corporate giants like Clear Channel use their second or third tier signals to keep others off the air, there's plenty of history to verify it.
They may be smart enough not to try to pull the same crap in Portland where word of mouth, and a decent coverage area, helped to make the progressive talk station (am 620 KPOJ) too much of a success to try to pull the format. Has a good signal day and night, too. Elsewhere, the good old boys have been trying to kill the progressive talk format ever sing it started by co-opting it and declaring it dead before it ever had a chance to mature or find an audience in many cities. Or to develop an advertising base for it.
No wonder radio is dying when the people who control almost all of the licenses think they can bully the rest of us by only airing lies and hatred and bile and fear from neo-confederate puppets who get paid lots of money to shout their talking points over and over again. I actually heard pro-militia talk on WLW "amen, brother, the white people need to stand together and show this country what it's about!" (no kidding, as heard on WLW a few years ago.)
There's an unserved majority of American voters who are not being spoken to by commercial talk radio in most US cities. Which is why so many of us stopped listening to them. Even though the airwaves are still public property and, by law, are supposed to representing the "interests, needs, and convenience" of the entire community. Time to speak up to allow some equal time on the air for someone else for a change?