I already have Directv but I want to get tivo. I know you need two inputs but my question is can you split one cable from the sat or do you have to have two seperate cables coming in from the sat. I have my hookup in to the cable box outside the thru the cable input inside to my tv. If i need two inputs then i would have to drill thru my house i assume. pls clear this up for me pls.

You only have one receiver right now, with one cable coming through the wall? Do you know if you have a dual-lnb dish?

I have the tri lnb sat with two receivers hooked up..living/bedroom. I want to get tivo for my living room. i'm thinking i can just split the signal too the two inputs on the box.
how do people hook up 4-5 boxes? it's got to be able to split.

The DirectTivo will come with a multiswitch which will split the signal for you. It'll split two cables into four.

You cannot split a single line from a single lnb for it to work. You must have two lines from the multiswitch

multi switch? where does this have to be hooked up? my sat is on top of a two story house, i'm starting to think i just need directv to come and hook it up.

You most likely have a multiswitch on the back of the dish.

You will need to connect the Tivo with two of the lines coming out of that switch. Check your existing receiver to see how it is connected.