The grounding sounds wonderfully over-built.
The signal from WNYZ-LP, real CH-6 is more than 40 dB stronger than the signal from WRGB... It would take truly extreme efforts to have any hope of receiving the WRGB real CH-6 signal at your location. No consumer grade equipment would get you close to the 'ball park'
The situation for WTNH is better, but still in the realm of 'Extreme Measures'. A ganged array of Antennacraft Y10713's (two, four or eight could be tried) might have a chance... this would be an experiment... not guarantied to succeed. What you would be building is electrically similar to a UHF panel antenna... but physically larger so that it will operate at the lower frequency range.
http://forum.tvfool.com/showthread.php?t=1024