Too much space on top and bottom of ad under header

Hello,

I’m having difficulty decreasing the space on top and bottom of the ad between the header and content. I’m running twentyeleven showcase theme. I have a static page setup (using reading options to display) with the showcase theme. I just added the javascript for the ad in the blank html space in the “pages” section. I disabled ads and sharing for that, as they originally showed up. The blog is inlandnorthwesteats[dot]com. I’m very new to all this, so please let me know if there is any additional information I need to provide. I did try searching the forums and google, but because of my lack of coding knowledge, I wasn’t able to tell if they would provide me the solution I was looking for. Thank you for your time!