my CTR is 0,67% for january. previous month are about the same. I think it´s pretty low... what a "normal" CTR?
maybe because your adsense ads are not place in the heat zone. you placed it at lower portion of your website.
maybe improve the quality of your site? and there's no normal CTR, each site is different from others
I just added a 768 x 15 ad under the menu, will see if it helps. It seems like no one clicks on the 120x600 ad at the bottom of the right sidebar.
I thought you were limited to 3 ad sections to not break the google adsense rules... can you have more ads than that on a single page?
For a better CTR place a medium rectangle on the left which will be an image ad only... and right next to it on the right place a text ad only. This will prevent your text ads from being duplicates (right and left) and give you more ads to show.