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I have had fair to good coverage on some ridgelines there. None on others.
Personally, I consider it a good idea to have one along. In the case of emergency, you may find cell coverage long before...

Not a bad idea to be prepared, but I've spent quite a few days & nights hammock camping in the Mt Rogers area (often starting at Massi Gap), & I've not spent a night under a bug net yet.
Now,...