what do u hope to pick up with an antenna? There's nothing being broadcast on those frequencies anymore (well almost nothing). You need to plug it into a digital converter or cable box to recieve anything.
FYI, if u put the logic board into a Color Classic, it will function the same, and for some yet unexplained reason will set the CCs display to 640x480 without any software or screen mods whatsoever. And as far as I can tell causes no damage to the CC. Kind of cool having a little 10" TV at that resolution. More practical in my book than that big honking 520-based TV case.