For what it's worth, I've always had problems with getting a decent GPS signal, even in a fibreglass dome.
I eventually get a signal (time it takes > my patience), but frankly, it's permanently mounted nearly always, and setting the date/time isn't that big a deal, especailly if you can do it with the above app, you pretty much never need to touch the handbox.
You're never really going to "fix" the issue of getting the GPS signal (short of the extension method).
Bonus is that you can hook this all up and do it during the day in the dome.
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