A sample iTunes RSS feed can be seen at:

http://www.podcast411.com/howto_1.html

note the URL reference is HTTP ............. .MP3

This is what the RSS feed looks like for a CBC iTunes subcribe:

<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0" xmlns:itunes="http://www.itunes.com/DTDs/Podcast-1.0.dtd">
    <channel>
        <title>CBC News: Hourly Edition</title>
        <link>http://www.cbc.ca/podcasting/</link>
        <description>The latest national and international news, updated every hour</description>
        <itunes:summary>The latest national and international news, updated every hour</itunes:summary>
        <itunes:category text="News &amp; Politics"/>
        <itunes:author>CBC News: Hourly Edition</itunes:author>
        <itunes:image href="http://www.cbc.ca/podcasting/images/promo-hourlies.jpg"/>
        <image>
            <title>CBC News: Hourly Edition</title>
            <url>http://www.cbc.ca/podcasting/images/promo-hourlies.jpg</url>
            <link>http://www.cbc.ca/podcasting/</link>
        </image>
        <item>
            <guid isPermaLink="false">http://podcast.cbc.ca/mp3/hourlynews_20111012_1900.mp3</guid>
            <title>CBC News: Hourly Edition for 2011/10/12 at 19:00 EDT</title>
            <description>CBC News: Hourly Edition for 2011/10/12 at 19:00 EDT</description>
            <pubDate>Wed, 12 Oct 2011 19:00:00 EDT</pubDate>
            <itunes:duration>4:30</itunes:duration>
            <enclosure length="270" type="audio/mpeg" url="http://podcast.cbc.ca/mp3/hourlynews.mp3"/>
        </item>
    </channel>
</rss>

https://landing.athabascau.ca/pg/photos/download/85348/

Replace the above URL in your feed with:

https://landing.athabascau.ca/pg/photos/download/85348/landing-episode-one.mp3

Let me know what happens.  I give it a 50% chance but you are the pioneer on this quest.