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How to add a Widget Zone & Ads Above or Below the Main Menu ?

Create a new dynamic sidebar (widget zone) from the Appearance / Manage sidebars.
http://d.pr/i/1jWOX

Insert a new Ad widget to the newly created sidebar.
http://d.pr/i/1gGye

Then insert the widget zone above or below the main menu from within the theme panel
http://d.pr/i/1aD0N