How do I renforce a cardboard antenna for outside use?

Question

I bought Mohu Releaf cardboard antenna. It works much better outside than inside. Mohu explicitly advises against outdoor use of its indoor models, yet I wrapped it in a plastic bag and hung it out of window.  It looks a bit shabby so I am looking for ways to improve both the look and protection against elements.
I tried placing antenna between window glasses yet it gets less channels than outside. I have a big outside antenna, again it gets less channels.

Dimensions: 9″ x 11.5″
Effect of elements on Leaf antennas
http://mohu.freshdesk.com/support/solutions/articles/4000026474-can-i-use-my-leaf-curve-antenna-outside-or-in-an-attic-
Releaf model
https://releaf.gomohu.com/#specs
Update. I used it in a plastic bag to reduce deterioration yet eventually bought Winegard Elite on a sale, now have a few channels more. May be will use the leaf  with bedroom television.

Ecnerwal · Accepted Answer

At the risk that it might alter the properties of the cardboard in some way that might matter at radio-frequencies, I'd slather it in epoxy resin for waterproofing and follow up with a coat or two of spar varnish for UV protection.

Correct answer by Ecnerwal on December 6, 2020

FreeMan · Answer

I'd agree strongly with the suggestion to get an outdoor rated antenna, however, if you really want to attempt to use your cardboard antenna out in the weather, I'd suggest plastic lamination.
I'm not sure how big the antenna is, but they make lamination machines for 8.5 x 11" paper and they're cheap enough for home purchase. If you need something bigger, a local print shop may be able to do it for you or at least direct you to where it could be done in your town.

How do I renforce a cardboard antenna for outside use?

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