On a lark I've been winding loading coils for a mobile HF antenna. I had seen the $20 ARRL article, figured, what the heck. I'll modify it for what I have. I had some finger stock (? not sure that is the right term, it's plastic wire spacer) and used a 1.25" PVC pipe for a 5.7" long coil with 0.25" turn spacing. The stock uses 0.125" but I skipped slots, as my Armstrong coil winding machine isn't very good. I got 21 turns, and... oddly enough, it hit 20m perfectly, installed into a 12m Ham-Tenna. With widely spaced turns it's probably not very good, but it was cheap enough. Last night I made another one, this one with 1/8th inch spacing and 40 turns, to see if I could hit 40m. However, I'm curious about the wander lead. All the plans I've seen have the lead from the low side of the coil, not on high side. I'm not sure it matters? Current is the same on either side of the coil, but the whip side is high voltage relative to low side--but the wander lead is all the same voltage.