Re: freeview aeriel booster
If your normal antenna works fine with a single freeview box then you don't need any fancy hi-gain amplifier. All you link to are OK brands, just go for one that has enough capacity for how many connections you need (though an extra 1 or 2 won't do any harm)
as far as your last question I have no idea what you mean but one antenna is one signal path, what the masthead does is spit the signal into isolated paths and amplifies the signal up to or more than the strength of the original one. (whether it has gain first then splits or splits first then gains isn;t really an issue as long as the split in noise free)
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