I have had success in using the outside cable jack for a satellite dish, I tried it in my driveway and it worked!
The issue is that the satellite receiver can't go through the amplifier wall plate because it blocks the dc voltage that the receiver sends to the dish. I bypassed the amplifier wall plate for satellite dish use as follows:
The back of the amplifier wall plate has three RG6 coax cables attached, from outside cable jack, from roof antenna, to second TV in bedroom. I removed the coax coming from the outside cable jack and installed it on the back of a feed-through coupler next to the wall plate. I then attached a short coax cable to the amplifier wall plate where I removed the one from the outside cable and ran it through the wall so I could hook it to the newly installed coupler feed-through as shown in the photo.
So now the RG6 coax from the outside cable jack comes to the newly installed feedthrough coupler, I can either attach the coax going to the amplifier wall plate (as shown in the photo) so both TVs can use the roof antenna or park cable via the outside cable jack as normal, or I can connect the new RG6 coax (shown disconnected in the photo) going to the satellite receiver thereby bypassing the amplifier wall plate. This is a simple direct way to get the satellite dish to the receiver, a regular spiltter won't work as it doesn't allow the 12v dc to pass through, a more complex diplexler would work, but I went the simple way.
I cut a hole in the cabinet where the receiver will go to run the RG6 coax and the HDMI cable to the TV, the power cable will go there as well.
One problem doing it this way is that I don't get Satellite reception to the rear TV, will have to work on that.
I seem to have made this sound a lot harder than it actually was to do.