Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: If I already own a TiVo box to use it on my local HD channels using a antenna do I need a TiVo  Subscription
Document: I already have a single tuner TiVo with a lifetime subscription. We use it constantly and decided to get another box for the main tv. The dual-tuner won out for 2-tuners and built-in ethernet to connect to network. It has exceeded expectations and is very easy to use. The only thing that would be better is the Series 3 HD unit, but that is too expensive and we do not have and HD tv.
The box has very limited functionality even provided you purchased a subscription from Tivo (I did) - because today all cable providers including Verizon FIOS already moved to fully digital channels - therefore you may view only ONE channel at a time... Absolutely, absolutely useless purchase... Well, I [sorry for my stupidity] cannot figure out what the Tivo subscription for unless you can use the unit as two channel DVR?
We have Dish Network but have discontinued most of the regular and local channels ( get OTA HD for locals via antenna). I just subscribe to 2 international channels which are a must for my family. After building a computer PVR and loading Sage TV software I found out that it was very user unfriendly. Finally I got a good deal on Amazon ($185 with $150 rebate) and bit the bait. What the heck, it would only cost me $30 plus a year's programming ($129).
I have cable with no box and an analog TV, so this Tivo model let's me record two channels at the same time. If you are more up-to-date with your provider equipment and television type, you may not want this particular Tivo. I don't think it has the space HD will need, and it doesn't record two digital channels at the same time.
Ouch. You don't just buy a Tivo, you need a Tivo service subscription that costs more (annually) than the Tivo. I might be the only one on the planet that didn't know that.I just wanted a DVR to replace the old VCR, just to record cable TV channels. Without the subscription service, my new Tivo is just a dead box. If you just want to replace the old VCR (like me), make sure the new item has a digital tuner and doesn't require a subscription.
This is more old school for the thrifty.I tried recording at 'Best Quality' and at basic quality - no difference visible to me, so I get the full 80 hours by using basic quality. I purchased the wireless receiver, added my wireless network to the Tivo box, and voila - I can download movies from Amazon and Blockbuster, for purchase or rental. If you want to use Netflix as your source to download movies, then you need a newer Tivo model, not this one.
This was an absolutely useless purchase. I expected the box to provide at least basic functionality like being able to view my home pictures, listen to my music and/or view my videos. None of the above. Unless you buy a subscription from Tivo (what for?) and pay monthly fees of $12.95/mo or $129 per year or $299 for 3 years or $399 for the rest of already not new, rather 4 years used box - the box is DEAD.
So since this Tivo alleged to do the same things, I thought I'd go this route.Then I saw this: Record two basic cable channels, or one basic and one digital cable channel, at once. I read that and wasn't quite sure if it would work with my DirecTv subscription. I wanted this Tivo for the bedroom since I have no HD there and no DVR. I called their customer service and was assured by TWO reps that this would work fine with my DirecTv.
The picture thru the tivo unit was fuzzy. Maybe the Tivo unit is not designed to receive antenna TV. The Tivo unit made all chanels come in fuzzy. Also I didn't like that you could not use any of the functions without a Tivo subscription, but it seems that without the monthly subscription the whole thing is useless. I am now very happy with a standard DVR that does not require a monthly subacription and works much like the old VCR used to do but without the tapes.
I just got the DT box to replace 2 tivo series boxes. Basically you get the same box with the excepttion of recording 2 shows. For me was better because now I pay only 1 bill insead for 2 boxes.But tivo has been very slow to release better boxes. If my cable company would have a better box that doesn't crash I'd be using it. Thee box has 2 tuners, HD, more space and etc...Tivo 2 dt is not worth it for new subscribers.
Answer: You can use it like an old VCR -- record by times etc...  But the guide (show listings) will be empty.  Also -- if it is a Series 2 the HD will not look great as the TiVo does not support HD.