In general it is advised to build masts symetrically – for 3 cornered trunks it would be 120 degrees each. Anchors sholud not be closer to the mast than half of its height. For example for a 50 meters high mast, anchors must be at least 25 meters apart from its axis.
Well in most cases stiff mast is a good mast, this is one of quality factors. Cheaply built masts are rarely stiff. Stiffness is mostly important for radiolink communication and satellite dishes (form of radiolink in fact) – where power beam is narrow and focused. Imagine a laser pointer that is aimed at a tower…
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