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Ray Dome for small helix

Mc Donalds and Taco Bell both have 32 OZ white plastic drinking cups they
are 7 inches deep and 4 inches opening.
They fit over a 5 or 6 turn helix . They pass the microwave test, an could
be attached to the reflector with RTV or
a small clamp.
I wonder how UV would effect this plastic? Also the hot and cold temperature
of summer and winter?
73 Jim     W8WRP

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