To prevent duplicate ads across multiple
zones on the same page you must use the Competitor Exclusion
feature and make an individual campaign a competitor of itself.
To learn about the competitor exclusion feature, click here.
For this feature to work, you must use the same PageID across
ad tags. You cannot use Iframe tags.
When creating a new campaign the campaign will not appear in the
list of competitor exclusions. So you must first create
the campaign, then edit/update the campaign and select itself as