I use a Pinnacle TV for MAC DVB-T Stick on my 1.66GHz Mac Mini, into a Dell 24inch monitor. All good for both viewing and recording 
(I'm guessing that you don't really mean in your Mac Mini).
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27" 2.8GHz i7 iMac, 24" 2.4GHz iMac, 2.66GHz MBP, 16GB iPhone-3G
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