We use ours, don't consider it outdated at all.....
in fact i have a similar unit in my attic at the house. We don't have cable or sattelite, and along with a DVR and streaming form netflix, really don't miss it.
Unless it's causing problems, I would just leave it if I were you..... you never know when you might want to tune in to see some local news or whatever....
But if not, or if it's broken or otherwise casuing problems, then I might consider removing what I could from the roof, but wouldn't worry with removing the whole works unless replacing or repairing the roof anyway.....
But I suppose it would be easy enough to patch the roof with a piece of the appropriate roof material and eternabond or dicor
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