Ive harvested some bits of that cable out of moblie phone extension antennas from handsfree car kits , flexible multistrand core is best , soft jacket material , you could hardly do better for unballanced connections within equipment , Rg174u is another Rf cable that works well for audio . There is another white jacketed ptfe braided cable I sometimes see in lots on ebay ,often out of Huntsville Alabama , probably ex nasa stuff , often green lettering on it , silver plated core and screen , designed to be bombarded by subatomic particles for years and keep going ,nice if you can get it .