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One recent modification was replacing the "old" 120x600 skyscraper block with the wider 160 px wider version. Has anyone experienced a change -either positive or negative- by making the same change?
I'm guessing that the wider version will be more effective, but it appears to have the opposite effect.
Thanks in advance.
That said, that size ad also blends in much better with my site, where-as the 120 wide ad sort of disappeared into the navigation area (my left navigation area is 200 pixels wide).
So look at your site structure first and foremost. If the ad looks good to you, it will likely increase CTR. If not, stick with the smaller ad is it is working for you.