This is my first post.
However, I have watched and searched this forum for sometime.
Unfortunately, I have had no luck finding information concerning this situation.

I live in a Pittsburgh, PA area apartment with a dish looking through a southern window (Glass replaced with a Lexan pane) and get about 70 to 85 signal strength with my old RCA DRD430RG satellite receiver and oval single LNB antenna.

I rarely loose satellite signals.
However, a level 3 thunderstorm will shut me down for about 4 or 5 minutes.
Local Directv provided channels are never lost.

I use one RCA receiver feeding 4 TVs via splitters through my apartment RG-59 coax wiring.

I use the X-10 Pyramid RF/IR wireless for changing channels since the satellite receiver is located in the spare bedroom thus all TV's show the same channel.
I live alone and that is fine with me. In fact, it is desirable.

I am thinking about upgrading to HD from (Directv) my current provider.

Questions:
1) Will the lower signal strength be a significant problem for a HD system?
2) How will RG-59 coax work over 20 to 60 foot runs if I use 4 HD satellite receivers in different rooms connected to the HD satellite antenna.

I thank you in advanced for any replies.