AS far as RG-59 goes it has the same 75 ohm impedence as RG-6. The difference is the RG-59 has a smaller center conductor and the shielding is not as good as RG-6. If fact the best way to tell the difference is to look at the center conductor. However if the RG-59 is of good quality it will pass Direct TV SAT signal.
For example, my stick house is wired completely with RG-59 and I run Direct TV without any noticeable loss on the signal setup meters. I am running TIVO and two other receivers on RG-59.
RG-6 is the preferred cable to use but before going to the expense of re-wiring check it out.
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