There are synonyms for both that can be understood easier: Most of the time gain is given for them, but the more important value of noise figure is missing. Now we do see a lot of preamps on the market. This knowledge was brougth into the receiver design of the Mode-S Beast as well as the Radarcape. This is one of the most sophisticated operational modes in amateur radio, and needs high transmission power as well as most sensitive receivers. During my active time at ham radio I was very active in earth-moon-earth communication, that is sending signals to the moon and getting the echo back, up to 5.6 GHz, far beyond the ADS-B frequency of 1090 MHz. We do see various offers for any kind of preamplifiers that are promising wonders, so let me give an explanation for the true important factors when using such devices.
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