Custom channels is a very useful feature for Google AdSense publishers where they can track their AdSense performance by assigning ad units to channels based on their unique criteria such as colors, formats, or placements.
A sample implementation is to create a channel for each ad position, and see which one performs best. In the case of TechRecipes, you can create channels such as techrecipes.net-top and techrecipes.net-bottom. You can also create channels such as color-red and color-blue and then use a custom script to rotate ads using the colors to see which one gets higher CTR.
CTR or clickthrough rate in Google AdSense is the number of clicks your ads receive vs the number of time the ads are displayed. If your your site has 100 pageviews and your ads receive 2 clicks, then your site’s CTR is 2%. CTR can be as low as 0.05% or it can be more that 20%. Optimizing your site to get higher CTR could help improve your Google AdSense earnings significantly. These are few things that you can do to get higher CTR for your sites.
