I agree with Billiam. On the issue of using RG-11 coax.
Reception situations that require squeezing more of signal strength out , 2 to 4 dB more signal. RG-11 has less loss then RG-6.
RG-11 coax is good to use.
Here are Ultra low noise amplifiers that will squeeze out a few more dB of cleaner signal.
http://www.kitztech.com
http://www.researchcomms.com/hdtv.html