In your experience, is the upper right half of a page a lousy place to put an Ad?

On my blog, the site logo takes up the left half of the top, then I have a "banner ad" on the right side. It's the same size as the site logo on the left, and has similar color patterns, but it seems clear that it is an "ad" as opposed to being just a part of the logo.

It doesn't get many clicks at all, so before I put a lot of work into making that ad banner look nice, I thought I would ask here what the general opinion of the performance of adsense ads (or other types of ads) are when they mirror the positioning of the site logo.

Thanks.

_{(I realize this is the adsense forum and not a banner ad forum, but I thought the people who do adsense would have the best experience with positioning of ads, regardless of the ad type.)}