Ranges should also be varied depending on ante. If there is no ante, or the total ante in the pot is only a fraction of a big blind, then its often completely fine to give big blind a walk, if it folds to you in small blind, and you look down at some trash hand. Whereas if the total ante is more than a big blind, you definitely can not give up without a fight to often. So in that situation you probably want to develop a SB limping strategy, where you then also mix in some "trap" hands. Or you simply limp all your hands.
__________________
|