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Thanks. I am adding about 100 feet of RG6 before CM-3410 amp. 100 feet RG6 has about -6dB of Signal loss. The CM-3410 has a gain of +15dB that covers for a 8-Way Splitter loss of -12dB. So my current setup has
antenna gain at 3 feet -> 40 feet coax (-2.5dB) -> CM-3410 (+15dB) -> 8-way Splitter (-12dB) -> 40 feet Coax (-2.5dB) = -2dB + antenna gain. With this my DTV converter box is showing only 50% of the signal bar.
When I add approx another 100 feet of coax, then my setup will have:
antenna gain at 20feet -2db (above calculation) - 6dB (+100ft RG6) = antenna gain at 20feet - 8dB losses.
With a CPA19 I gain +17dB in preamp. That will offset my -8dB loss due to extra 100feet of RG6. I don't know how much gain I will get by increasing the antenna height from 3 feet to 20 feet. That's why I thought I need a preamp. With the preamp, I could safely insert power via the coax of approx 140 feet cable to the antenna.
I am very new to the DTV world and TV fool. I cannot climb the roof and should employ someone to do it. That's why I want to make a right decision on the preamp. Please let me know if I am overlooking something.
With the preamp, I am hoping that I could get the Greensboro Towers at 59mile/60degrees on the backside of the C5 antenna. Currently I do not. I am planning to point the C5 at 210degrees as suggested by "electron" in an earlier thread on antenna selection.
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