They come folded up small in a small box. You should have no trouble getting it through that opening.
I installed an HBU22 at my inlaws' house, and it's been working fine out in the weather since before the analog switch-off in 2009. Snow, ice, etc. Still looks and works like new. I currently have the directional FM antenna (FM6) and in my last house had the turnstile Omni (FMSS, I think), all of which have been fine. In case you're unsure of the brand.
Their web site doesn't seem to work all of a sudden.
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