do antler keep the same shape every year ar do all the tines change location each year?

They get either bigger or smaller, depending on age. But they carry a similar trait thruout their lifespan. They will get more and different looking points, but will keep a similar all around look

Deers antlers will usually change usually getting larger, the myth of antlers getting smaller is just that a myth although some deer do cary the characteristics from bad genes making it appear that a bucks antlers are going down hill.