Poor Quality Coax Stalls My 20m Antenna Project

I was keen to use my limited budget to get a full wave 20m loop up on the balcony of my apartment using some speaker wire and removable hooks. I looked online and as keen as I was to get some high quality coax from DX Engineering and other online sources, the delivery costs were too high. I decided to order from a local supplier. I ordered only 10 m due to my limited budget. What arrived was a 100 metre roll- win right!? Wrong! The coax was useless and poor quality with just 5% braid coverage it would be an instant TVI generator, entirely unsuited to HF amateur radio from my apartment.