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Personally I find this process of manually trying to figure out the actual URL of these yum repos very annoying. It would be very nice if yum.conf came with dozens of these mirrors commented out so that it simply a question of selecting one after the installation. Or you could go and uncomment all of them and let yum randomly pick one in the list to spread out the load between mirrors (and away from redhat.com servers).
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I did a little footwork a complied a small list from the fedora mirror site. these have been tested.
However these are only US http repos, and they should be inserted into /etc/sysconfig/rhn/sources. You can also use these to base entries for yum.conf
Enjoy A