Each of the four towers is guyed in two
or three places with polypropylene rope. Been up a long time and seems
OK. But, there isn't a tribander and rotator on top.
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Polypropylene rope is usually coloured ,blue or yellow or orange or red
.. The pigment causes the material to deteriorate due to exposure to UV
(sunlight) .....even here in northern Scotland.
Result : life is approx 8 years
If they would use carbon black (soot) as pigment/filler life of the
material would be infinite ..........but then they wouldn't be able to
sell the rope any longer in reasonable quantities.
More expensive alternatives are (black) dacron or polyester rope (the
latter as mostly used for sailing yachts) ;these last for ever.

I currently use polypropylene for guying a 13 metres (43 ft) mast .
The guys have been in use for 7 years and will need to be replaced next
year . I probably will be using polyester rope.

Frank GM0CSZ / KN6WH