What you can't do, is add all sorts of invasive tracking to RSS to confirm that the user saw the ad, and that it wasn't filtered out. You have to get more creative with wording that works the ad into the descriptions for the articles, and even then, there's no guarantee.
Advertisers love to burn money, but they draw the line at not being able to verify that the spend did what was promised.
Advertisers love to burn money, but they draw the line at not being able to verify that the spend did what was promised.