Something to consider is putting a spring on the bitter end with a weight to keep it reasonably taught, and run it through a pulley to the antenna. I've had to do that here, as there seem to be more windy days than not.
Bungee Cord?...
Honorary Old Fart
Dirty Old Mans club Junior Auxillary
(Dirty Old Man in waiting)
Get off My Lawn.
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4 out of 5 Seniors Prefer the taste
of Alpo over other leading National Brands