"Richard Clark" wrote:
There is no "tuning" of Discones. They are what they are,
broadbanded. Their lower frequency of use is basically defined by the
length of the lower skirt elements (verging on quarterwave). The
higher frequency is more a function of the feedpoint gap between the
disc and the cone. If this is adjustable, you are in luck. If it is
not adjustable, something else is broke.

As you describe a vertical whip, that is NOT the usual part of a
Discone, but is a means to offer an even lower single band's coverage,
usually 6M. It's addition is not a bonus at higher frequencies (and
may actually make the antenna deaf). However, this has nothing to do
with SWR. If this is a 6M addition, and you have the option of
removing it entirely, try that.

73's
Richard Clark, KB7QHC

Hi Richard,

Just wanted to mention, there are several discones on the market assembled
with circular arrays of horizontal and 45-degree angle groundplanes plus a
trimmable vertical element which is the only radiating element of those
discones. The vertical radiating element comes from the factory cut to 2m
but can be shortened to suit. I have owned a few and they are anything but
deaf.

Best regards,

Jack Painter
Virginia Beach