Hello:

I expect to put up a simple receive only antenna using a fair number of
"Tie-Wraps" to hold the wire against a few standoffs and supports.

I am not sure, but I guess the HD variety, or T&Betts brand, of Tie-Wraps
are made from Nylon ?
But really not sure.

How well do these generally hold up outdoors ?

Do they become brittle and decompose (a bit) after a while and break ?

Are there better types available ?
etc. ?

Much thanks,
Bob