On Wed, 27 Sep 2006 04:40:51 -0000, Dave Platt
wrote:
I modelled a copper-pipe EDZ, mounted at the top end of a conductive
mast. This one came out with 5.85 dBi in the favored direction, and a
2.5 dB front-to-back ratio.

Have you considered using the much simpler moxon? This one has a
forward gain of 5.6-6.4dBi (6.2@146MHz) and a front-to-back ratio of
18-31dBi (29@146MHz). It uses #12 AWG wire. Thanks, --John

CM Model: moxon for 2m
CM parms = [29.1337, 4.18345, 1.4995, 5.70003, ];
CM
CM A: 29-1/8 in.
CM B: 4-3/16 in.
CM C: 1-1/2 in.
CM D: 5-11/16 in.
CM Wire Diameter: 0.0808081
CE
GW 1 3 -0.10626 0 8.774 0 0 8.774 0.00102626
GW 2 15 0 0 8.774 0 0 9.514 0.00102626
GW 3 3 0 0 9.514 -0.10626 0 9.514 0.00102626
GW 4 3 -0.144347 0 9.514 -0.289128 0 9.514 0.00102626
GW 5 15 -0.289128 0 9.514 -0.289128 0 8.774 0.00102626
GW 6 3 -0.289128 0 8.774 -0.144347 0 8.774 0.00102626
GE 0
FR 0 401 0 0 144 0.01
EX 0 2 8 0 1
GN -1 0 0 0 0.0 0.0 0.0 0.0 0.0 0.0
RP 0 1 73 1001 90 0 1 5
EN