If it were me I would go with the Winegard Slimline. I have had no hiccups with the same Slimline on two different rigs and it was installed both times by me.
I don't know what the price difference is between the two. Most people want the HD capabilities. I see a lot of domes on motorhomes. But my bet is most of them were installed for people without HD. We have noticed also big rigs getting the Domes taken off and replaced with Slimlines. You can still use the Winegard for standard definition.
In the years we have had ours there have been no updates needed for it to operate properly.
Joe
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