First, Welcome to the MOC toneman56!
Item 1. is correct.
Item 2. When you do that and you turn off the antenna boost (in the master BR closet, or whereever it is in your rig), your satellite receiver will show on any television (either or both TVs, whichever is turned on). The problem is that if you have the receiver in the LR where the jumper is located, you won't be able to use the Satellite remote if you are in the BR. To solve this problem I purchased an IR Remote Extender - the IR transmitter is in the BR, then transmits to the IR receiver that is aimed at the satellite receiver "remote eye" in the LR. If you turn on the antenna boost, you will receive air signals, but if you are receiving Satellite why bother.
Item 3.: If you are referring to the offair coax jack on the back of the satellite receiver I can't help with this one. At home we don't use offair signals because where we live they are pretty awful. We use DirecTV and have selected the local channels for our area and they are beamed to us into the satellite receiver so that we don't need an offair antenna. This means we get better and more local channels combined with our DirecTV programming.
There is a fourth option but requires a lot more work. I use a splitter at the jumper. One output goes to the living room receiver and the other output goes back in the wall. Then in the bedroom I put another satellite receiver for the BR television. This allows me to have separate setups for the LR and the BR. We sometimes have guests staying with us (they are in the LR) and they appreciate their own setup that does not affect what we see in the BR. If I had only the one receiver that sends its signals throughout the rig, then the person with the single remote controls what is shown on both televisions. I hope you can understand what I'm rambling about.
In the MOC there is no such thing as a long post or a dumb question. If that were the case I would have been kicked out a long time ago. (I like that your Ford has an "attitude".. :-) )
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