In alt.internet.wireless DaveC wrote:
You're thinking of the 2-LNB model, which is oblong. This dish is a round,
symetric parabolic. Equal curvature, horizontal and vertical.

The comments about the dish being a portion of a parabola appeared long
before the multi-LNB dish became available.

In any case, using the original LNB location as the focus would be a good
thing to try.

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Clarence A Dold - Hidden Valley (Lake County) CA USA 38.8-122.5