Domes are limited to SD and are great if that is what you want. I installed a RF Mogul dish for DTV with HD and SWM. Push a button to deploy and Wingard has a similar dish.
I believe the Canadian service is Star and I don't know how far south you can get service if you plan on US travel. Perhaps that is a factor for you.
I also upgraded DTV to the HR44 receiver which can record 5 shows. It also supports a mini Genie receiver for remote TVs. I use the same receiver at home. A lot of this is US based and you'll want Canadian based information as well.
My prior HR24 receiver has a RF remote option. The HR44 is RF only. This means that the receiver can be anywhere vs a IR remote. RVs often don't have deep cabinets that are reasonably located for the receiver. Ours is mounted vertically in a closed cabinet which is fine with the RF remote.