I want to use an OTA HD antenna...

I just checked DTV Tivo and it has a seperate connection for the antenna(my analog Sony only has one coxial input, but I'm wondering if I can split the signal between OTA and the cable feed).

Gmood1, Tvad and Zieman,

Will the digital tuners replace the need for an OTA antenna? I have both DirecTV and extended basic cable.
I've been contemplating switching to Fiber-Optic(Surewest) since the phone and computor service are with that company. I could purchase two Tivo HD DVR's with Lifetime Service and be ahead of the game. What do you think?

Gmood1,

Are you saying that I can connect the antenna to the Tivo directly for OTA HD eventhough it's an older analog version?
Surewest offer's DVR, but I'm used to Tivo and it's mine to keep, not lease. I can also have it hacked without consequence.

I'll have two Sony XBR Wega's(a 40" and 36").

I'm close to downtown and the landscape is pretty flat. Exactly what do I need for an average rooftop installation? THe signal would be split to four TV's.