In this recent installation,
http://forum.tvfool.com/showthread.php?t=13659 the tripod is a 5' Rohn 811 and the mast is a 10.5' chain-link fence top rail (1-3/8" diameter). The nearby trees give the owner grief when the wind blows, but the 91XG at the top is almost always providing a reliable KVOS signal from nearly 70 miles out, over an edge path. There has been very little observed sway or vibration in the wind.
For your application, this and other information is general at best, your situation is specific and the only real or relevant one.
Quote:
QUESTION: Would replacing the 5-foot post with a 10-foot post gain allow channel 9 to come in more consistently?
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I'd suggest you experiment with alternate mounting location and height. Use temporary methods to place the antenna at the test position(s). IE. don't drill holes in the building unless you know they are worth it. If you find an ideal location or height, then contemplate how to make a stable and permanent mast or mount. The bottom line is, you won't know if you don't try.