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Power gain is directly proportional to capture area for the same efficiency, and efficiencies are all fairly similar, plus the noise temp goes down slightly as dish size goes up, so there is a (very) small improvement there too. 24" to 30" would be 1.9+ dB, 0.9m to 1.2m would be 2.5+ dB. The...

The move from 0.5 to 0.9 meter would have netted about a 5-6 dB improvement in CNR, roughly 4x what the LNB change would yield. Small antennas have a higher noise temp at the same elevation, giving less advantage to a better LNB, so you should max out antenna size before going to lower temp...

It depends entirely on how adequate your signal is now: if poor, 1.5dB might nudge it up to good; if good then perhaps to very good -- but it probably won't make a poor signal very good.

Yes, early C-band setups (circa 1979) actually brought the 4GHz signal amplified by the LNA indoors, originally through copper hardline pressurized with dry nitrogen, then through foam-filled aluminum hardline. Early Downconverters (often single channel, not Block) weren't weatherproof, so it...

Noise Figure is based a terrestrial ambient temperature reference of 290K, and is defined as how much noise is added by passing thru the amp. So 0.3 dB adds 21 degrees K, 0.6 dB add 43 degrees K. The unknown is the Antenna temperature at your elevation angle above the horizon (the higher, the...