I tried some tvfool reports using the coordinates for your new hill location. The signals are not as good as the first hill location in post #5 at 10 ft, but still usable:
10 ft:
http://www.tvfool.com/?option=com_wr...d2438143458058
CH7 NM 42.3 dB 1Edge
CH9 NM 36.2 dB 1Edge
CH38.1 NM -29.3 1Edge NG
20 ft:
http://www.tvfool.com/?option=com_wr...d243a64bf5b603
CH7 NM 47.6 dB LOS
CH9 NM 43.3 dB LOS
CH38.1 NM -11.8 1Edge maybe with preamp and separate UHF antenna
30 ft:
http://www.tvfool.com/?option=com_wr...d243f318247686
CH7 NM 50.1 dB LOS
CH9 NM 45.4 dB LOS
CH38.1 NM +19.2 dB LOS looking better but still with preamp and separate UHF antenna
10 ft would probably give you 7 and 9, but not 38.
At 20 ft 7 and 9 are looking good; 38 might be possible with a separate high gain UHF antenna.
At 30 ft all are LOS and looking excellent.
If you can get your antenna high enough at the new hill site you have a good chance for at least 7 and 9 without a preamp. One factor in your favor is that the coax loss for VHF-high is much less than for UHF; about 2 dB per 100 ft VS 6 dB per 100 ft of RG6.
400 ft of RG 6 would give a loss of 8 dB which you would subtract from the NM figures for 7 and 9.
Antenna gain can be added to the NM figure and the signal pwr figure. You can add the preamp gain to the signal pwr figure, but you can't add the preamp gain to the NM figure without subtracting the preamp NF because the preamp NF reduces the SNR of the signal.
Andy S. Lee, the creator of this forum, has a good post about NM here:
http://www.avsforum.com/forum/25-hdt...l#post15700679
You can make Andy's diagrams larger by clicking on the 2nd set at the end of his post. They were attachments before AVS switched to a new (UGH!) software and added so many ads that they squeezed the posts to a narrow width, giving the impression that ads are more important than the posts. Click again on each diagram if you see a plus sign on your cursor, which will make the diagrams even larger.