I think the newer Montanas have KeyTV or something like that. If yours is a 19 or 20 (or maybe even 2018) it probably has it. That thing is supposed to be 'smart' and knows what you are trying to look at and does the 'booster' thing automatically . Also, if you are trying a satellite, if it doesn't have a separate power line to it (fed thru the coax instead), it won't work thru the KeyTV thing.
It this is all true, then you need to run a separate line or remove the keyTV and direct connect to the satellite feed.
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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