Up to this point, I have been fortunate to not have to deal with that problem. The restaurants that have been kind enough to advertise on my radio show happen to be restaurants about which I wrote generally favorable reviews long before I had the show. These restaurants are run by professionals and are consistently good. Repeat visits bear this out.
The radio show grew out of the popularity of RehobothFoodie.com, so I would never compromise the objectivity of my articles. Visitor feedback suggests that this is the main reason so many people use the site regularly. Of course, I will never accept restaurant advertising on the website, since, unlike the radio show, all the reviews — positive and not-so-positive — are right there.