My winegard system is a 2018 system and does not have a SIM card in it and does not have a slot for one on the roof mount. It is not the dome roof system but has multiple black antenna's. At one point I was able to get thru several windows through the system but could not get to the window where I could buy their data plan. I called winegard and had their tech walk me through but even that did not workout. I gave up and went with a verizon hotspot.
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