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This morning I discovered the presence of a well-known car manufacturer ad with a YouTube-esque play button in the middle of the image. Of course I didn't click on my own ad, but I found it interesting nonetheless.
So you can monitor both ad-type and site.
Or you could go for 300x250 ATF & site-1 & location-1 and 300x250 ATF & site-2 & location-2 - allowing you to monitor each separate placing, each site and each ad-type.
I think one ad code can have up to five 'channels' attatched
I have very limited advertising/adsense on my site but I do have a 250x250 box above the fold (it fits perfectly into the template) and a large banner accross the bottom of each forum page. I "turned on" only the footer banner, curious to see what revenue will do.
Today, I got an email from Google asking me to change description for the custom ads placements with '300x250 ATF' in order to let advertisers know that I've placed medium rectangles above the fold on my site.
Earnings are pretty much the same, only eCPM is a bit higher. We'll see how it goes on long term. I guess it'll be a couple of months before we can see the real effect from Custom Placement Packs Program.
I created a "custom" channel code 300x250 ATF
I may be wrong but, I think they are refering to placing 300x250 ATF in the description box. This way advertisers will know that you are displaying a 300x250 ad block above the fold.
Click the checkbox marked Show this channel to advertisers as an ad placement and enter a description for your channel. Keep in mind that advertisers will see the name and description, so you want to provide something accurate and informative that will represent your site well.
Not a very good deal.
Regarding the ATF and BTF 300 x 250 ad, I'm not sure if it added some revenue. For a week or more it seemed like the revenue jumped quite a bit, but then it went down a bit and even if I added many more 300 x 250 ads, the revenue stays similar, although I noticed the significant increase in variety of advertisers. Although I also noticed that the more I spend on Adwords the more I make on Adsense. If I don't spend anything on Adwords, then Adsense revenue goes down as well.
On one high traffic page, CTR declined 22% and eCPM declined by 37%
On another less highly trafficked page, the same stats were about 10% and 13%, respectively.
Traffic was pretty stable/comparable.
I can't afford to do this, so I'm reverting to the large rectangle on the high traffic page.
I can appreciate Google's desire to ask publishers to help increase the pool of these ad sizes, but I can't wait indefinitely for advertisers to begin using them...