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Squeezing 2.2 dB noise out of a system should only be expected to 'help' make the marginal signals a bit more reliable. There won't be a dramatic 'night & day' difference.
As far as precisely matching the preamp gain to your distribution system losses goes, don't worry about it. An extra few dB of gain in your case may help with tuner noise (which would be measurable with lab grade equipment, not worth spending money and time on). Tuners are designed to adjust to a very wide range of signal power. You simply want to avoid overloading the preamp. An overloaded preamp distorts the signal, making them less reliable or even unrecoverable.
My recollection may be wrong, but I think there used to be a large price difference between the KT-200 and nearly equivalent competing brand-name preamps. The minimal difference at this point makes me agree with teleview, if you make the effort to optimize your existing system, the KT-200-COAX has the best NF.
Home Depot usually stocks PVC junction boxes with rain tight covers. Kudos to meridish for posting the photos of the type of box I was thinking of.
Last edited by GroundUrMast; 24-Oct-2012 at 5:54 PM.
Reason: Kudos to meridish
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