This is the winding form that I plan on using.  It will be made of fiberglass.  It's one meter tall, the base is 30cm in diameter and the top is 20cm in diameter.  I did make sure it was going to be a difficult built.  But, I figured out how to get rid of allot of parasitic capacitance in the windings.  That means that I'll have a higher Q at a higher frequency.

From my study of solenoids, I'm figuring that one that's 3 times longer than it's diameter should work better than most, and actually, it should be centered on 50cm based upon the height of this coil.  So, even though the primary is probably only going to be a total of 4 turns, it will be 60 cm high and 40 cm wide.  It's close the proper geometry for a good solenoid.  For the primary, I'm going to straighten it, fill it with corn syrup, freeze it, and then bend it.  That way, I don't crush the pipe while I bend it.  Some ice crystals are desired, so when I get the firmness of the mixture right, I might share it.  That might take a long box and some dry ice.  When it's between 0 and 32 degrees, I'm bending it.  Once, it's been shaped, it's getting a good coat or two of epoxy.

I got the idea for this secondary form, from this spider coil used in crystal radios.  I wound one using 40lb test fishing line as a spacer by running it parallel to the winding.  That worked out so well, I figure I can do it for this secondary.  The top is smaller in diameter than the bottom because, I've wound on posts before, and they like to bow inward.  That cannot be helped.  But, you can get the windings to tighten up where you want them to if, you start at the narrow end and work toward the wide end.

It almost looks like a miniature of Warden Cliff Tower.  There are 13 fiberglass dowels/rods there.  Only odd numbers allow you to in effect weave the wire to maintain a good gap that will effectively reduce the turn per turn parasitic capacitance.  What you don't want to do is use flat wedges.  Any dielectric non-conductive material is inclined to have a dielectric constant.  Air has a dielectric constant of 1, and glass is between 3 and 5.  That means a conductor running flat against glass will have a capacitance that is 3 to 5 times greater than air.  The posts minimize that.  If it were easy to find a ridged dielectric material with a value of 1 or less, I would have by preference used flat wedges and left gaps where the rods are.

let me know how it works!