The park cable inlet in the outside bay should be used for cable only.. It is usually RG-59 and "Lowest bidder" at that. That said, Many people re-route the other end of the cable for SAT-LNB line,, I do not recommend this however..
What I would do is,, Let me change that WHAT I DID, is run good quality RG-6.. This runs two ways,, Since I have a roof top dome it runs to the roof.
A 2nd run goes to a Ground Block connector which is mounted on my Brake Bell crank Bracket down Below under the hood (I was able to get there without using a drill you see).
I would run a RG6 line from the place where you plan on parking the Sat receiver to either a Ground Block in the Basement, or where I put mine, or to a bulkhead (Through wall) to the outside, Label it SAT-IN.
WHY: Well average RG-59 has 4 times the loss per foot of average RG-6 (Source Belden Cables). the Lowest bidder stuff may be even worse.
That said top quality RG-59 is nearly as good as lowest bidder RG-6.
But my rig has about 50 feet of Low bidder 59 in it, that's 200 feet equivlent RG-6 loss at best, likely more, and 300 feet is your line limit without a booster.