Yes...very interested in that as well.
Only problem w/that was that he had a C7 that was working, and which would have had a smaller coverage area than either the C8 or the L-Com antenna, right?
I can't believe we never asked you to do an antenna swap, @SuperDupe. Correct that you didn't try that?
A C-7 with the L-com antenna installed, so coverage on the stock C8 with stock antenna was possibly worse for his application (in a different radial pattern).
True, but I was thinking before he had the mod, the C7 likely worked pretty well, not a disaster like he was having w/the C8.
After I did the antenna mod on my C7, I did get better coverage... I'm not thinking the C8's antenna are defective, but there might be something to say for the shape of the different antenna. I do have two stories, but I also extend outside with devices around the yard and in front as well. But in this case, although I was having some issues with the outside devices, I still find it odd after many many tires, I had trouble pairing devices in nearby rooms or even next to the hub. I only put the bigger antenna on in an attempt to get better coverage outside and didn't do it for my pairing issues... Just happened to try pairing the Z-Stick and it was instantaneously better...
Dana, I hadn't tried swapping the antenna before and was probably the only thing I hadn't tried.
I know nothing about radio waves, but also wondering if I have interference or something else that was just not having it using the stock antenna... Could that be a factor?
Anyway, thank you both and everyone else that jumped in to give me help! 
Thanks for all the details. Glad you are past the bad times. 
At some point if you ever get a little bit crazy you could try swapping the stock antenna that is still on your hub doing Zigbee duty to replace your LCOM antenna temporarily. The stock antennas are dual Z-Wave\Zigbee antennas so they can serve either signal. Be interesting to see if the problems returned.
But I wouldn't do that. 
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