The 10m-4m-2m-70cm Antenna

Hi all,

my goal was an antenna, which works on 10m, 4m, and perhaps 2m and 70cm, and which works more or less in all directions.

To obtain a non-directional characteristic, I used a non-symmetric dipole. One side of the dipole has length 1.70m, the other has 3.30m length. The ends are attached, the coax cable hangs down, connected via a balun or a choke balun with coiled up coax cable, such that the dipole has a slight V-shape. To obtain a sufficiently wide-band balun I used about 10-20 windings of coax cable with about 30cm diameter.

It turns out that it works without a antenna tuner on 10m, 2m, and even 70cm, and with an antenna tuner on 4m. On 2m and 70cm I actually got quite nice results. I could reach relays as far as 100km away and even further, even though the relays have vertical polarization!

The simulation file for Xnec2c is for the antenna 4 m above a cylindrical building with 5m radius. It has hence 2 grounds, one for the building and one for further away. This is simulated with the 2 ground cards GN and GD in the xnec2c file. The pictures show the gain pattern when viewed onto the z axis and the y axis (where these axes appear as a point). It can be seen that the antenna radiates in every direction, and that it also has lobes which radiate very flat, important for DX'ing!

Vy 73, Gerald, DL5BBN

10m dipole nonsymV2gnd 28Mhz.nec