Lee,

You can greatly increase the Q of a long length of coax cable by
cutting it into 7 equal short lengths.

Then put six lengths round one length and connect all seven in
parallel. In theory, this increases Q by 7*7 = 49 times for the same
capacitance. And it occupies less space. But when outdoors it is
more difficult to seal against the weather.
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Reg, G4FGQ