While there are so many informations on how to add extrawidget to many segments of your blog, such info have failed to address the how to add extra widget between header and post.There may be several instances where you may have to add extra widget between yoy blog header and blog post.One of such reasons can be for ads placement another of such can be for banner placement,facebook like button etc.
With this simple tweak,you will be able to add extra page element between your blog post and blog header as seen on my home page
Login in to blogger.com
Navigate to Design > Edit HTML
Back Up your template and go to Edit HTML