Ed, spread 15 feet at the ends.Nothing critical once your beyond the 15
feet.

I have varied the lengths of the legs, where one is longer than the other.
For example think of two dipoles one cut for 3.6 and the other cut for 3.8.
I have also played with 4 wires spread 2 vertical and 2 horizontal.

The biconal has been around for ever and was widely used in the old TV
antennas to broadband the response.

If there is any interest, I could dig out my old notebooks and post the SWR
tables of a bunch of designs.


"Ed" wrote in message
. 92.175...


Now to the original question, in spite of the data in QST, I have
found spreads of less than 15 feet in a practical environment will
not achieve your goal. YMMV.


Again, thanks for the comments. For clarification, though, could you
describe what you mean by the 15 feet spread for a 75M antenna? The QST
author is describing a biconical antenna with two dipoles tied common at
the feedpoint, but spreading out a couple degrees to the ends.... his
figures indicating 6 feet at the ends working, but 15 feet the spread if
using the recommended 2.8 degree angle from the apex.

Is this what you mean, or are you describing two dipoles separated their
full length by 15 feet?


Ed