I'm using http://www.m0ukd.com/Calculators/Slim_Jim/index.php to design this slim jim antenna diagram.
very helpful to me, maybe for you all too. You can design slim jim antenna and j-pole by using this web calculator. I'm thinking of home brewing, but not now. maybe someday, when i got the spirit of MacGyver into me ;-). well, thanks to 9W2WTF for inspiring me a lot about this hobby.
p/s: I'm not good on hand drawing. i beg your pardon.