at my house
the tv and the pc(i used video card to output to tv) are at least 20 fleet apart(straight line)
but i cannot keep the line straight coz my mum will kill me
so i need 30 fleet
i tried one $60 last night
I can see NOTHING at all
I had systematically tried
1. 18 fleet noise but still can see
2. 30 fleet noise and almost cannot see
so i concluded that it is cable problem
(you can figure out how much resistance and inductance over such cable)
I MAY seek something more expensive(almost $200)
but I worry that those shopkeeper will cheat me