I am new to shortwave listening. I’ve done a little research on my own and have purchased a St. Jean STS909X2 shortwave receiver. Considering to put a string antenna in my attic. I would welcome any advice would like to know specifically what coax cable I should use for the antenna lead with Welbourn choir a 3.5 mm stereo plug.. Advice on plug would also be appreciated. Thanks for your help. Bill