Schedule a service call. Once they come out, let them know you have a concern that the location of the antenna is compromised by a tree. They will evaluate it. Do not sign the work order until you're satisfied you have sufficient signal.
Do not tell the CSR that you want your antenna relocated, because they will assume for aesthetic reasons and will charge an extra $50 on top of the service call.
That's what I am saying though. I don't think a dish offers them at all anymore. You'd have to get one from a 3rd party. The 222 family is no longer offered.