On Fri, 21 Nov 2008 16:26:27 -0000, "christofire"
wrote:

The apex angle of the cone in a discone can be chosen to yield 50 ohms
terminal resistance over part of its usable bandwidth, and that angle is
different from the apex angle(s) needed in a biconical dipole for the same
impedance. The usable bandwidth is always limited by the limited
flare-length of the cone(s) and usually also by the accuracy of the apex or
apices where termination is made.

Hi Chris,

This needs heavy qualification, and probably too much such that a
graphical treatment would outweigh the words for contribution:
http://www.qsl.net/kb7qhc/antenna/Discone/discone.htm

73's
Richard Clark, KB7QHC