Mike,
You need to be aware of your local code, with respect to
tower height and setback. It may not be possible to go to
70'.
You will be better off with 25G than what you presently have,
regardless of height. Can you put the taller stick in the
same place as the 40'? Perhaps use the same foundation?
4 way guying is perfectly acceptable. Use of screw-in anchors
is not. Not where you'd hit a neighbor if one failed.
73/n2ea
jimjarvis@ieee.org
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