OK, firstly, I've moved your thread here as it's more about connecting sat boxes than computer networking.
SCART is just the name for a connector type and a SCART connector can carry several different types of audio and video signals, so you first need to know exactly the type of signals are present on your SCART connector.
The most common are Composite video, Component video and RGB video, along with analogue 2 channel audio.
Composite video is standard definition only and also has the poorest picture quality.
Remembering which way a converter works is simple.... From, is from the output of a device... and To, is the input of the other device.
Eg: HDMI to VGA would be converting the output of an HDMI device to the input of a VGA device.
You speak of having monitors having VGA inputs, but do not say if these are CRT or LCD screens.
There can be considerable differences between what both types of screen can display, in particular resolutions and scan types and rates.
Eg: Old screens will probably not be capable of displaying HD resolutions.
As for the 'TV Tuner Box' I assume you mean a DVB-T Set Top Box.
These vary depending on which country you are in, which you didn't mention.
With Austech being an Australian website, we assume posters are in Australia and are referring to Australian standards of equipment unless they tell us otherwise.
You cannot tune satellite frequencies on a terrestrial tuner or terrestrial frequencies on a satellite tuner.
The RF out of the satellite receiver is most likely analogue RF, intended to be tuned with an analogue TV tuner.
Terrestrial set top boxes mostly only have digital tuners in them, so they are unable to tune analogue signals.
Hope this makes sense to you.
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