Originally Posted by MostlyDifferent
So what's the verdict on amplified or not?
Your answers have kinda beaten around the bush, so I will too
The problem with amplifiers is that they are not "ideal", they do things other than amplify.
A strong signal, in or out of band, can overload the input resulting in harm to weak signals.
Your TELEVISION signals do not look like they will cause much damage per your TVFool results. FM signals are a problem sometimes, and even your balanced (relatively speaking) TV levels may not be consistent. IF you get an amplifier, don't buy the high gain junk everywhere on eBay. 10dB SHOULD be more than enough to overcome cable losses and put low noise gain near the antenna.
MANY years ago, I was involved in low noise amp designs. We did several things to minimize but not always eliminate problems.
Filter out of band offenders
selectively attenuate in band offenders
amplify as closely to the antenna as practical
ensure amplified output did not reach receiver overload levels
Commercial high quality amplifiers can (economically) do all of these BUT the selective attenuation. That takes technology and money ... AFAIK
it's still analog for RF frequencies of interest. It has become digital for audio, and is (by many measures) very economical.