How can I get rid of a header from my site.

How can I get rid of a header from my site.

The header in my mobile site has a lot of white space at the bottom that I can't get rid of. Is there some way to remove it so that there is not a huge gap? I just want the menu in the header but it creates a bunch of white blank space that I can't get rid of? Or can I at least disable the header(including menu) completely?