Twin directories of updates.redhat.com:

[DIR]  ftp://ftp.us.es/Mirror/updates.redhat.com/
[DIR]  ftp://mirrors.hpcf.upr.edu/pub/Mirrors/redhat/updates.redhat.com/
[DIR]  ftp://ftp.esat.net/mirrors/.3/updates.redhat.com/
[DIR]  ftp://ftp.jyu.fi/pub/mirrors/updates.redhat.com/
[DIR]  ftp://ftp.rz.uni-karlsruhe.de/pub/mirror/updates.redhat.com/