aspect ratio of low frequency long ferrite antenna

[coppercone2]

So I know some basic guidelines for smaller ferrite rod inductors to leave some of the ends unwrapped (for like 2 inch long, they seem to use maybe 50-60% of the rod)

I have a real low frequency hi mu foot long rod now, and I am wondering if I should follow the same 50-60% rule or does it get different when the aspect ratio starts getting weird.

It is 1 inch x 12 inches.

I think it will be used somewhere about or way less then 1KHz

I previously glued some crap together from junk parts but that project never went anywhere


And I am also wondering if it should be one continuous winding, or if I should make multiple coils (like a coil gun design).

This kind of gets into it, but its much larger then mine
http://www.vlf.it/romero3/ics101.html

Is 12 inches long enough to justify winding it into sections to try to lower capacitance?

[coppercone2]

And I even had thought about low capacitance windings, but it looks like it might be too difficult to predict what effect all these things could have.

[coppercone2]

I think it might be a good idea to do this because it has minimum difficulty but it makes it easier to modify it, because for a receiver antenna, it hardly seems to matter if you solder each of the spools together, and its easier to wind. Assembly might be a tiny bit more tricky because it involves some fine splicing.

and it gives it the ability to pick the exact coil size by selecting the correct tap point.