I don't know anything about the dome/mushroom, but I have a Winegard Sensar IV (has integrated "Wingman"). I did the retrofit from my Winegard Sensar III that hardly received any channels. The IV does much better than my III did. If I had waited a short time, I could/would have gone with the newer Rayzar retrofit if only because it isn't directional which to me is just a pain.
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