Link to external URL in post title of RSS feed in WordPress

I have it currently so that my post title links to an external URL using the following code in my index.php file.

<h1><a href="<?php echo get_post_meta($post->ID, 'external-link', true); ?>"><?php the_title(); ?></a> <a href="<?php the_permalink() ?>"><small>★</small></a></</h1>

I'd like to have the title of my RSS feed to do the same.

I'm using the FeedBurner FeedSmith plugin (Ver. 2.3.1) if that makes any difference.