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post #4 of Old 01-09-2008
Idiens
Larus Marinus
 
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Although the horizontal beam width (50% power) of a typical small marine radar is in the single digit degrees (say 3 to 4), the vertical beam is nearer 45 degrees. At 30 degrees heel, a lot of energy goes into the sea and sky, on a fixed installation, but this is always the case, even upright. The near sea clutter is rejected and the sky offers little return, so the remaining reflected signal still comes from targets, rain and longer range sea clutter.

Jonathan-Livingston
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