Embed a Youtube Channel into HTML with iFrame

I'm trying to embed a Youtube channel into a HTML page.

For example I take this channel address: http://www.youtube.com/aaaa

I used this code:

<html>
<head>
</head>
<body>
    <iframe src="http://www.youtube.com/aaaa"></iframe> 
</body>
</html>

The problem is that it doesn't work. I tried with another site, and it works. What can be the problem?