By placing multiple ad units on your pages, you give users more relevant ads to choose from, and you may reap the rewards from more clicks as a result. Here's where to go to see if your pages can benefit from additional ad units.
Already placed the code but are showing fewer units than expected? This is because our multiple ad unit system works best for pages with highly targeted ads and therefore may only display the first few units (See how a first ad unit is defined).
For publishers who are familiar with HTML, here are some advanced tips:
1) Create a channel (see AdSense Help for creating channels) for each ad placement. For example, if you have a leaderboard on the top of the page, a skyscraper on the right hand side, and another leaderboard on the bottom of the page, make sure you have a channel for all the top leaderboards, a second for the right skyscrapers, and a third for the bottom leaderboards.
2) Test the channels for at least a week to compare which position has the greatest clickthrough rate.
3) Make sure the the ad unit with the highest clickthrough rate is the first instance of the ad code that appears in the HTML. Since the first ad unit is always filled before the rest, you want to make sure that ad unit is located in the best placement on your page.
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