2. Stop using sidebar skyscraper banner or rectangle ad unit.
3. Use the 336X280 large rectangle ad unit.
4. Set in both options: text and image.
5. Place three (3) large rectangle ads among your blog post.
6. Place the first one after the first or second paragraph.
7. Place the second one somewhere in the middle of the blog post.
8. Place the third ad at the end of your blog post.
9. For those of you who are using WordPress, use the free Quick Adsense Plugin to do the work for you.
10. Write your article or blog post with around 500 to 700 words, so it has ample space for you to insert the three large rectangle ad unit.
That's how I improve or increase my Adsense earnings.