It's for non-digital TVs. Most TVs today come with one of these already built-in, but if you have an older TV then chances are you would need one of these to get channels.
oh, crap. i misunderstood what this was. it's not what i thought it was. i need someone to outbid me. my bid was 2500 pts. please bid 2501! i'm sure it's great for what it is for, but it's not what i needed. sorry about that.