I ordered my first antenna kit from RST way back when I was building N56ML, and that antenna worked fabulously. When I bought N891JF over two years ago, it had serious antenna issues, and I thought I'd need to build another one, so I ordered another kit from RST, but then corrected the issue and forgot about it. About 18 months later I got the antenna kit in the mail. It'd been so long that I'd completely forgotten ordering it, and STILL didn't think I'd ordered it...I thought it was sent to me by accident.
So I emailed Jim Weir and told him of his "mistake", and that I'd be needing one for my next plane anyway, and would send him a check, or I'd be happy to forward it to whomever it was originally intended, and I'd order another one. He said I had indeed ordered it, and he'd discovered the oversight and sent it on, despite the 18 month lag! I had a good laugh over that, but it made me wonder if I was losing my mind! I chalked it up to my uber-stressful job and moved on, however. I'd send you the kit but gave mine to Paul Visk a few months ago. I'm sure toroids and copper tape can be bought at Digkey or Newark, and copper foil from AS&S or Wicks, but an email or phone call to Jim might produce a kit in the mail, although you've probably tried that. Merry Christmas, y'all... Mark Langford ML at N56ML.com http://www.n56ml.com