Clearly a case of engineering getting in the way of physics.
>My Rohn catalog dated 1987 states that anchor alignment has a tolerance of
>plus or minus 0.1 degrees. If you have a 100' tower with an 80' guy radius
>your anchor location would have a tolerance of plus or minus 1 11/16 inches.
>You certainly could not site a tower leg this close by eye. In fact it
>would be difficult even with a transit.
>I have used various methods already mentioned and my towers are still
>standing, although probably not in tolerance. For one house with an outside
>fence I made an AutoCAD drawing and measured the anchor locations from the
>walls. I have also installed stakes at some equidistant points and used
>ropes along the ground to line up the anchor. I have also used a transit.
>Even a transit is difficult you're installing anchors for an existing tower
>because you can't set it up in the exact center.
>See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
>Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
>questions and ask for Sherman, W2FLA.
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