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That could be the case, but I dont believe that it is the major factor. The signal that I got from an angle was equal to, sometimes even greater than the signal from pointing directly at it. It still could be the case that the signal spikes are from the radiation pattern of the cantenna, but I dont have anything close to the proper equipment to test that with.
Another good method of attaching an antenna non permanently to a roof is with some pipe and some of thoes cement filled lifting weights. Stack a bunch of weights on top of each other, and set the pole in it, should hold up pretty well if you can find a pipe that is a good fit for the diameter of the hole in the weights.
Brian
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