I can directly capture the original digital signal of channels/shows that aren't specifically encrypted to prevent capture (see my sig). But our Comcast doesn't carry Monsters. It might turn up on Universal HD, but I have corruption problems, with that channel, and they seem to only show things once. It's old, so it might hit Encore, but our Comcast only carries HD, from Encore, on OnDemand, which is a very, very iffy channel for capture. (I might need to call the tech out here).
I'll search Comcast's schedule, and the newsgroups, though.
If I'm not mistaken, Monsters HD has a fondness for cropping everything to 16:9, so it might not be that desirable, anyway.
Edit : Hmmm, thought I had the direct capture link in my sig. Fixed.