Question about 234 x 60 ads

[realmaverick]

I've recently switched adsense accounts and having an issue. My large rectangle ad usually shows a single ad, which has a great CTR. It's been over a week and my new account doesn't show any single ads, just 4 small ones which don't do nearly as well.

Now... I figured if I had a 234 x 60 ad, it only shows one ad and looks as similar as I'm gonna get to the single ad displaying in the large rectangle.

Though because it can only show a single ad, does that mean there will be less competition and therefore less CPC? Or will the top advertisers all still be competing to fill that slot?

[realmaverick]

Just a heads up, I tried it and it worked a treat. CTR is back to where it was and beyond in fact.

[azlinda]

I just added a few of these smaller banner ads, and they appear to be better targeted than the larger banners.