What are the lowest loss coax cables available?

try at
http://www.hubersuhner.com/

http://www.gore.com/en_xx/products/c...ial_cable.html

pl

A good quality heliax will give good results up to 3.5GHZ.... but it is all down to the frequency you want to use

It is also a function of the diameter. Larger diameters means lower loss until the circumference becomes near a half wave length.

I have seen a special made cables a foot in diameter. It was rigid and custom built to reach from the transmitter to the antenna in a direct straight line.

By experiance
the best cables are heliax

semi solid
{like and organ it is best to bend it only a few times then it may fracture at the folds }

copper tube solid or cored inner
solid or double screened outer

heliax is next to a wave guide

trust it