Military aviation based website - need help to maximize earning

Site: http://www.defenceaviation.com/
Average daily visitors: 1000 to 1500 per day
Average Adsense earning: $3 tp $5 per day with averge 15-20 clicks
Average Adsense impressions: 3000-3500 perday
Average pages/visit: 2
Average time spent on site: 3 minutes.
Top 10 countries visiting the site in order: US, Australia, Canada, India, UK, China, Japan, Germany, Malaysia and france

This is my ad placement inside the post http://www.defenceaviation.com/2010/12/j-xx-chinas-first-stealth-fighter-takes-to-the-skies.html

I want to maximize my adsense earning. Can someone help me? Thank you for taking time reading this post.

 

Your ad above your comments is almost useless. Your CTR is realy low so you should edit them a bit.

 

Ok I will remove the one before the comments. Where should I place it? What do mean my CTR is low how can I edit it?

 

You need to see google adsense's heat map because what you are doing is reversing what they advise you of

 

Now how can I do that?

 

Here you go:

 

@Lordo

Could you explain what this means?

 

The darker, the more clickable areas.

 

yes he is right

 

Where can you find the heatmap on Google's site? In Webmaster tools, Analytics? Right in Adsense?