I’ve been long time searching for a card or USB TDT HD compatible with all three main Operating Systems I use and in the end I found it, is the WinTV NOVA-T-HD:

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It works perfect both on Ubuntu 10.10 and OS X 10.6.5 just plugging in, you don’t need to setup anything. I didn’t test it on Windows but drivers for it are included.

Within Ubuntu I use it with “Me TV” (sudo aptitude install me-tv).

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On OS X you only must to install Eye TV and it will work like a charm (this is the hardware that is into famous Mac compatible dongles “elgato”).

I bought it on a MediaMarkt for under 50€.