Ken,

Think helical. Several years ago I made a 40 meter J-pole using twin lead.
Wound it around 10 ft. of 1" PVC pipe. Worked well for field day, signal
strengths comparable to those from a full sized dipole... but with the
advantage of being omni-directional. Get some 4" or 6" PVC sewer pipe and do
the math for length. Should be interesting. Hmm, think I'll go visit Radio
Shack soon!

73,
Dale NJ7C