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Originally Posted by Sleeping Dog
Thank you for the explanation. I have very little background in antenna theory.
Oh GOD! I am such a numb-nuts. My best friend was a radio and radar guy on a Navy ASW P-3 Orion. I'll bet he could give me some "hands-on" help with the antenna installations so that I don't screw things up too badly.
My sister's house has a metal roof, but the facia is wood and only overhangs the underside of the porch ceiling about 3/4 inch. The bottom of the gutter is about 4 inches above that. I could mount the Rootenna about 3 inches beneath the porch ceiling and be clear of the gutter by at least 7 inches. It also probably wouldn't look as goofy as a Yagi tube.
May I also presume that the above ground elevations of the antennae should optimally be the same, assuming that the "ground level elevation" of both buildings is the same? (or am I being TOO anal about planning the installation?)
Please forgive my questions that may seem simplistic and obvious to the more knowledgable among you, but in the past, I have seen little things get overlooked on big projects that caused major headaches.
Again, kind regards and many thanks for your help and suggestions.
SD
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No. Just so they have a clear view of each other, without stuff being too close to the center of said view along the path. (Search Fresnel effect or zone in reference to microwave radio transmission.) At 2.4Ghz, you are not going to have to worry much about being close to the ground, in relative terms, anyway. At low frequencies/long wavelength, say 40 meters, (approx. 7 mHz, or 0.007 Ghz) yagi type directional antennas get all kinds weirdness if they aren't up high enough. Again, it has to do with the clearance vs. wavelength calculation.