He will jump the fence when let outside and take off into the neighborhood. He never comes home on his own, we must go find him. He will not stop. He lives in a 3 dog 1 cat household.
It is an absolute fact that *this is what Siberians do*. They find ways to escape when bored, and they take off.
Neutering him — while always a good idea — may not do much to help this problem. He's already learned how easy it is to jump the fence, and how much fun it is to be loose.
Not sure how tall your fence is, but Siberians require a 6-foot fence, preferably chain link. Very often you have to run a "hot wire" around the inside of the fence, about 1-foot off the ground, to discourage them from digging and messing with the fence in general.
Tying him into the yard may work in the short term, but is not a long-term solution. He will only become more bored, which will make him noisy and destructive. You need to "Siberian-Proof" your yard if you intend to keep this dog.
You may also consider erecting a kennel run inside the yard — a 6' x 6' or 6' x 10' chain link portable kennel with a chain link "lid" would do the trick. If one of the other dogs could also be kenneled with him during the day to keep him company, all the better. If not, you will need to find some way to keep him entertained or tired (i.e. lots of exercise).
As an absolute last resort, you may think about finding the dog another home, one better set up to handle him. As I've *always* told people, Siberian Huskies are not the breed for everyone.