Stub Tuned Radial - uses 4 - Covers 40/20/15/10 meters
For 30m Butternut recommends 4 seperate 24 ft radial wires spaced between the Stub Tuned Radials
For 75/80 Butternut includes wire and recommends at least 1 or 2 60 to 65 foot radials (234/Freq in Mhz).
Do not pull Stub Tuned Radials too tight.  I suggest antenna support line.

Original twinlead is Belden 8230 - I don't know if you can find it.  Other twinlead may work fine.
Radio Shack 15-1175

More info :  http://www.bencher.com/pdfs/00239IZV.pdf
WB9DLC website home : http://wb9dlc.com