>From the geometry of 3 equally spaced guy wires,
it is evident that the load carried by the guy wires
IS EXACTLY EQUAL with the wind coming in-line with
a single guy or bi-secting a pair of guys.
The WORST CASE is if the wind is in line with a FACE
of the tower, 30 degrees from a single guy wire, placing
ALL of the load on that single guy (direction) with an
additional 15% load due to the geometry.
FOUR WAY guying prevents the 15% additional load
from geometric considerations, but puts an additional
load on the tower due to pre-tensioning. (Not to mention
the additional cost and effort!)
de Tom - N4KG