Where to Place the Ad

Of course, results will differ for different sites. Generally,
wrapping blocks of AdSense ads in between blocks of quality
content works well or placing them toward the top of the
page works well and boosts CTR. Another suggestion is if
you have links provided on the page, try placing your
AdSense ads on top of them. Since attention is
automatically drawn to links, having your ads above links
will help to increase your CTR.

Vertical Ads

Place vertical ads on the right side of the page. Most surfers
tend to use their mouse to scroll down on the right side of
the page; so placing your tower (or vertical) ads on the right
gives it a higher chance of grabbing the visitor’s attention.
Small Ads

Studies say that the upper right hand corner is the first spot
on your site that someone sees. Try placing your small ads
at the top right hand corner. Grab the visitor’s attention
when they first come to your site with your AdSense ads. If
an ad interests them, they’re still going to browse through
your site, but they will come back to click through that ad.

Ad Format

Wider ads appeal to more visitors because they’re easier to
read. If something is easy to read, someone is more likely
to take the time to read everything rather than just glancing
at the first few words. However, it’s important to balance
your ads and the content on your pages. You’ll discover that
the way you think the ads should be for optimal CTR aren’t
always where they need to be. Monitor your ad placement
versus CTR and you’ll find the place and format that works
best on each page.

Size of Ads

Again, you’ll have to experiment on your site, but AdSense
webmasters and insiders all seem to agree that the following
ad sizes result in the higher CTR:
336 x 280 Large Rectangle
160 x 600 Wide Skyscraper
120 x 600 Skyscraper
These formats are easy to read and attract attention.

Color of Ads

Remember it’s very important for the ads to blend into your
site. Use the same background color for your ads that you
use on your site. However, don’t forget to change the color
of the links to match as well. This helps blend them even
more.