It means there is something between you and the transmitter that blocks LOS (line of sight). Most commonly a hill, a mountain, a building, tree, water tower, etc.
In order to get better reception you have to get your antenna as high as you can, so nothing stands in the way.
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The Following User Says Thank You to staticMHZ For This Useful Post:
That's a great explanation, and I thank you. I'm learning things here I never even thought about before. Who knew this somewhat frustrating would be so educational? <G>
Or you could just click on the link included in my post and view single edge or double edge diffraction with computer generated radio waves. The double edge occurs when radio waves hit hills, mountains or the radio waves coming from the first edge of diffraction. Your picture only depicts a single edge diffraction
I like the sketch and the photo, both. They each do a certain amount of illustrating what has been discussed. As for clicking on the link, that's so much work! lol
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