I'm not sure about your exact setup, but normally a power inserter is only needed if you have a particularly long cable run.
Try it without first. It should be fine. Your STB should provide enough power to operate the switches in the LNB's
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2013 Raptor 310ts Toy Hauler
2017 Dodge Ram 6.7l CTD DRW Laramie Longhorn
2008 FLHTC Harley.
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