TV Tuner

I have a old, bulky tv and I wanted to replace it.
But rather than spending 500$ on a small HD TV, I want to use my Hannsg LCD PC monitor as a TV.
I know I won't get HD on it, but can i use it to watch TV and play xbox 360?

From what I've been looking at, I need a tv tuner.
Can anyone suggest a good one for my LCD monitor, preferably under 100$, that will allow me to watch TV and play on my xbox?

also would the quality be any better when playing xbox if i use my LCD monitor?
Currently i can't read small writing on my TV, its just a blur

Well yea you should buy a t.v tuner card aspect a new t.v and try to buy an internal t.v tuner card ...