I don't know about doing that. I know for a fact that we get 1024 gigs a month (2 months over that without charge), so I suppose it depends on how much your TV is actually on. Here at the house, the one here in the living room is on 24/7, because if we're not watching it, it's set for the dogs.
We just got back from a place where the only thing our digital receiver would pick up was 4 PBS stations--2 for adults and 2 for children. We ended up using the wi-fi of the park and had Comcast.net streaming through our computer to watch a few things at night.
Streaming only at night from about 7:30 to 9:30, Monday through Thursday night and an hour of news in the morning for the weather, we ended up using 20 gigs in our comcast internet account according to the monitor I just looked at. If my exhausted brain is right, we used 20 gigs for around 15 hours. We'd go way over those 1024 gigs if we were streaming something all the time.
I'll leave the math up to you for a whole month since I don't know the hours of your watching habits.