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Yep, the antenna is pretty big, but the stations on your list are blocked by a mountain and you need a very sensitive antenna to pick up the diffracted signal (bending over the mountain top). If you click on some of the stations in your list (like WRGB), you will be shown a cut-away view of the terrain between the transmitter and you. From this view you can see that you are deep in the shadows of a mountain.
Despite the mountain being in the way, according to your tvfool analysis, some channels still have enough signal getting around the mountain to be picked up by a large antenna like the HD8200U.
As for disassembling the antenna after you've installed it, I'd say it's probably possible, but its generally not a good idea to do so. The antenna can mostly be assembled by hand via some screws, wingnuts, and some pieces that snap into position. The assembly steps can be reversed, but some of the "snap into position" parts can be a little hard to put back into their original pre-assembled position.
Winegard antennas have been known to last a long time (10, 15, 20 years), but that's assuming you aren't trying to disassemble it and reassemble it multiple times. After the antenna has been installed and exposed to the elements for a few years, some of the parts (primarily aluminum and plastic) will probably not take too well to being taken apart and reassembled. The risk of bending or breaking parts increases with age. The antenna will continue to perform well for a long time if it is left alone.
If you ever move to a different house, you are probably better off re-evaluating the new house location and buying a new antenna (if it doesn't already have one) that suits the new location.
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