As people have already said, the sensor bar can go at top or bottom, and it really doesn't matter except for personal preference. Just be sure to make the correct setting in the Wii menu.
Personally, I prefer it on the bottom of my TV (probably because I sit on the floor while playing, so the angle seems to work better), but recently one of our cats has taken to napping at the base of the TV right where I had the sensor bar mounted. So, to preserve feline harmony, I moved the sensor bar to the top of the TV.
Congratulations on winning your Wii!
ramuji
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