JeanieOwen
For reference, in addition to the modem and power pack for the modem, the radio from the dish needs to be returned when your service is terminated. If you aren't able to retrieve the radio from the dish assembly yourself, and/or if you have no one that can retrieve it for you, HughesNet does offer a service for this, but it's not free.
You can view the radio removal instructions, as well as the equipment return instructions, here. A copy of this is also included in the equipment return kit that's sent to you after your service is terminated.
The dish assembly, however, doesn't need to be returned. If you want that removed you'll have to either remove it yourself or hire someone to do it for you.