I had a dish walley and faced the same issue. You need to modify the way your cable is wired and then you can plug your dish into the cable port of your rv. It won't get 1080 but the picture is still pretty good. By using a cable switch box you can still get over the air and regular cable when you want it. I've included a link to a video below.
https://www.bing.com/videos/search?q...il&FORM=VIREHT
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