You really believe Camping's followers paid for 100 radio stations to air their claims 24/7? Who told you that, if I might ask?
Camping's Family Radio does have quite a few stations. And yes, they are spewing this nonsense. And sadly, he will make a bunch of dopey excuses and many of the gullible among us will still believe in him.
You can see the list of Family Radio's media outlets on wikipedia:
http://en.wikipedia.org/wiki/Family_Radio
Here's an excerpt from Wikipedia (not the best source in the world, but convenient)...
"Family Radio (aka Family Stations Inc.) began obtaining FM broadcasting licenses on commercial frequencies early in FM's history, and by 2006, was ranked 19th among top broadcast companies in number of radio stations owned. Currently, Family Radio's affiliates in New York City, Philadelphia, Baltimore, Washington, and San Francisco are on prime commercial frequencies and the licenses of these stations alone may be worth hundreds of millions of dollars if sold today."
Family Radio/Family Stations has no commercials and is funded entirely by donations.