Quote:
Originally Posted by geobrick
the chart shows 1Edge diffraction but in my post in a different section, I questioned how accurate this is.
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Just to give you a visual of what's going on, here's a bird's eye view of the coverage map for KOCE (Mt. Wilson) around your neighborhood.
In these coverage maps, red, yellow, and green represent very strong signals while cyan, blue, and purple represent weaker signals.
If you look a bit below where the transmitter is shown, you can see how the Burbank hills casts a shadow across Burbank itself. Anyone close to the base of the hills is deep in the shadows and will get less signal than people farther away because the radio waves cannot bend at steep angles.
In your area, something similar is happening. However, since you are further from the transmitter, the shadows tend to be much longer. It looks like your entire valley is still "in the shadows" of the local hills, and no one has a line-of-sight shot at the signal until you start to climb the hills to the west of your location.
KOCE is on channel 50, which is a high UHF station. High frequencies cannot bend as sharply as lower frequencies, so if you were to look at other channels (lower UHF channels and VHF channels), you would see more signal getting down into the shadows due to better diffraction.