In my area, Raleigh NC, i can still get all of the raleigh and surrounding area stations. There are some stations though that i can't get at all now but only because they are much farther away. Like a station in fayetteville i used to barely get with antenna but i can no longer get w/o (i never listened to it anyway).

If you were to remove it completely it will depend on what kind of area you live in. If you live in/near a big city it shouldn't be a problem.