By activating the publishing feature, SharePoint will add an base url as first item on your top link bar.
This base url cannot be removed in the Site Settings, but with some style this can be done.
<style type=”text/css”>
.s4-tn LI.static > A {
DISPLAY: none !important
}
.s4-tn LI.static > UL A {
DISPLAY: block !important
}
</style>
Add this style to an Content Editor Web Part on the SharePoint page by editting the HTML Source or Paste the style between the Head tags in your masterpage.