I have been using Synthetic Textiles UV resistant double-braided 
Dacron/polyester antenna rope on a variety of wire antennas for over 20 years:
http://www.dxengineering.com/search/product-line/synthetic-textile-industries-antenna-support-rope


In comes in several strength ratings to suit the project and lasts for years.  
73, Rod - WN8R
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