Redfrog,
The flags I believe your talking about, are quite easy to set up. Whether they work or not is another story. The one I have is simply two poles with a cable connecting them, with 8 or 9 flags on it. Just unroll them like a scroll, and stick the poles in the ground.
Personnaly I prefer a kite or a hand held flag for hunting. I have used the line before but didn't notice a big difference in responce from the geese.
Ryan