Pancakes have been written about for a while in RADCOM of the U.K.
In Europe there is some experimenting going on below the
broadcast band but it is limited to a few watts.
The basket weave was mainly introduced to REMOVE the
intercapacitance of the coils and a capacity hat was
introduced immediately AFTER the inductor.
Because they were only using a few watts there was not a concern
regarding voltage breakdown, a concern that should be reviewed before
entertaining the idea at the end of a high powered whip !
Regards
Art



Cecil Moore wrote in message ...
JGBOYLES wrote:
With a spiral or flat coil you have a hat
and a loading coil all rolled up in one. Winding spiral coils is not easy, and
the mechanics of mounting on my mobile antenna have kept me from trying, but I
may yet.

There was a magazine article a couple of years ago about such
in one of the ham rags - sorry, don't remember which one.