Podpress feed corrupted

Well, that is probably not the fault of podPress.

The W3C Feed Validator show the source code of your feed and line 510 – 526 shows that the code contains after the end of the RSS feed content some code which not belongs there. It seems to me that this code is from the Beacon Ads. Where have you inserted the code? Or is it a real WP plugin?
Furthermore as the comment at the end says, something seems to be wrong with the super cache plugin.

#  </item>
# </channel>
# </rss>
#
#
# <!-- Beacon Ads Ad Code -->
# <script type="text/javascript">
# (function(){
# var bsa = document.createElement('script');
#    bsa.type = 'text/javascript';
#    bsa.async = true;
#    bsa.src = '//cdn.beaconads.com/ac/beaconads.js';
# (document.getElementsByTagName('head')[0]||document.getElementsByTagName('body')[0]).appendChild(bsa);
# })();
# </script>
# <!-- END Beacon Ads Ad Code -->
# <!-- WP Super Cache is installed but broken. The path to wp-cache-phase1.php in wp-content/advanced-cache.php must be fixed! -->

Regards,
Tim

I have not used this Super Cache plugin so far and I’m not sure but the comment in the source code of your feed says:

WP Super Cache is installed but broken. The path to wp-cache-phase1.php in wp-content/advanced-cache.php must be fixed!

I guess there are more helping comments in this file and as it says, you probably need to correct a directory name.

I’m using the editor program Scite to edit all kinds of files e.g. php, js, css, etc. That program has a feature called search through files. it searches throught the content of all files in a specified directory and its sub folders.

Regards,
Tim

The super-cache plugin leaves a comment in the feed but that is not the problem. The <script> section of the Beacon Ad makes the feed not valid.

I would search in all the files of the blog for this comment and the <script> section e.g. with Scite.
If it is not in the files then it is maybe in some old and unused option in the wp_options database table. If you uninstall a plugin then sometimes the plugins don’t remove options database entries on removal. Maybe there something left over of the super cache plugin. (You could search the super-cache plugin files for strings like get_option('name_of_the_option') to find out the names of the options of the plugin.)

On the other hand if you have made changes to the WP core files and you do not remember which files you had modified and you want to remove the changes then you could remove all core files and upload fresh WP files.
If after such an action these lines after the end of the RSS Feed are appearing then it is maybe in one of the theme files (e.g. functions.php).

I have no idea how these snippets ending up after </rss>. But it seems to me that the comment of the super cache plugin and the JS snippet of Beacon Ad are placed there with the same method.
If both are hard coded to a file e.g. /wp-includes/feed-rss2.php then you will maybe find both when you are searching for one of them.
But it is likely that these lines of codes are added dynamically by some function in one of the files. Because they are in every feed.

One possibility to add something after the </rss> tag is to use the action hook e.g. do_feed_atom -> add_action('do_feed_atom', 'add_something_after_the_end_of_the_atom_feed');
The function would look somehow like:

function add_something_after_the_end_of_the_atom_feed() {
echo "\n <!-- Hello World --> \n";
}

This could be in a theme or a plugin file (or a modified WP core file).

Either way your best chance to find these lines, is to search on the PHP files of your blog for the lines which you can see in the source code of the news feeds.
So download all the files of your blog e.g. via FTP and use a program like Scite to search.

sciTE is complicated.

I don’t know. Click on “Search” in the menu bar and head for “Find in Files”. A dialog box opens. Specify the folder with the files and the file name extension(s) of the files you like to search. That is it.

Only one file had the script in it.

Which file?

The wp-blog-header.php file is a WP Core file and definitely not a good place to insert such code snippets. One reason is that you would have to modify the file every you update your WP version.
Putting the code into the wp-blog-header.php file make your normal blog page invalid because the code is added outside the <html>-section.

Besides that. What was your goal by inserting this Beacon code there?
If you have tried to add this to your blogs header then should insert the <script>-section into the header.php of your current theme. Or consider using the wp_register_script and wp_enqueue_script function vie the function.php file of your theme.
Leave this code in the code in the wp-blog-header.php file is not a good idea.
If you post here the content of the header.php of your theme, I would help you to find the right place for the code.

When I took it out and refreshed the feed had the same problem.

If you make modifications to the feed producing functions and files then you have to clear the browser resp. feed reader cache before you start to load the feed again. Otherwise you will see no change.
Did used Firefox or an other browser control your modifications? In my experience it is very typical for Firefox to cache the feed and not refreshing it after clicking simply on the refresh button.