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Many Bloggers want to add ads in RSS feeds, the first option is FeedBurner which can insert AdSense ads into your feed items, but for that you need at least 500 subscribers to qualify, and you can’t use any ads other than the AdSense ads provided by FeedBurner.

It is possbile to insert other kinds of ads into your RSS feed with some easy tweaks

Follow these simple steps to perform this hack:

* Edit the functions.php file of your theme. If your theme doesn’t have a functions.php file, simply create one.

* Paste the following code into your functions.php file:


<?php
function insertAds($content) {
$content = $content.'<hr /><a href="http://www.wprecipes.com">Have you ?</a><hr />';
return $content;
}
add_filter('the_excerpt_rss', 'insertAds');
add_filter('the_content_rss', 'insertAds');
?>




* Save the file. You’re now displaying your ads in your RSS feed!


Explanation: First a function called insertAds() is created, which concatenate a code containing our advertisment to the $content variable, which contains the content of the post. Then, the add_filter() function is used to overwrite the the_content_rss() function with insertAds() function. Another filter is used to overwrite the_excerpt_rss() function as well.Now, rss feeds now displays your ads!
Source

This is a nice trick to increase google adsense earnings by section Targeting!

Some Basics:
Adsense ads are loaded dynamically according to content of page! Now after posting people comes to your page to read post. In this regard ads should be targeted to content of your post!

The beginners Way…
Google provides following HTML comment tags to implement section targeting,

<!– google_ad_section_start –>

…….. your post …….

<!– google_ad_section_end –>

<!– google_ad_section_start –><br /><!– google_ad_section_end –>