You would use one of the global templates, such as ad_above_top_breadcrumb and wrap the ad content in a conditional statement targeting that specific template.
Does anybody know which template needs to be edited to insert the Adsense code on the page with all new posts and there under or above the first unread post ? (XF1.5.24)
And another question: With what kind of code can I deactivate the banners for a "premium usergroup" ?