Well, that last is what I was thinking, and am hoping to find guidance on, essentially, “proper splicing”.
I’d have to splice to get the antenna up in the attic regardless, so, eliminating the thin cable might not be much of a bonus, but, IF splicing didn’t cause trouble, it seems like I might as well use lower loss cable...
Any guesses on the losses in .11” dia. 75 ohm coax @ DTV UHF band frequencies?
I wouldn’t cut the factory cable on your device.
Larger or smaller cable won’t make much difference until you get into long runs, just make sure you match the impudence to maximize power transfer.
I use a good quality RG-6 coax for long runs. Lowes sells a kit with F connectors, cable strippers, crimper and cutters in a plastic case for about 25 bucks.