tvtime is available from the core repository, as root:
# yum install tvtime
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xdtv will require that you do the following
instructions as root.
My only change would be to change enable=1 to enable=0.
That would mean that for the yum command you would need to add the following option
--enablerepo=xdtv
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For freevo and mythtv, you will have to hit the net and do a lot of reading up. However
Jarod Wilson's MythTV HOWTO is very good.