Good news!!!

We can now offer two duoband antennas for 6 and 4m. We use MMANA for the initial design, YO for element taper adjustments, and EZNEC for final arbitration.  We have moved away from the previous very time-consuming parallel feed system for the driven elements to the "open sleeve" arrangement, where the 6m element is fed with RF from the feeder and the 4m element parasitically excited by it. There is no drop in performance using this well-pioneered technique which was invented in the 1920's and has principally been used by Force12 Antennas Inc for some years. These antennas have one feedline for 6 and 4m. If customers wish to use two radios to monitor both 6 and 4 simultaneously, we recommend the excellent duplexers from www.crosscountrywireless.net. These have over 40dB band to band isolation and low VSWR on the correct band. Click on their website address for more info.

We now have in production

4N6 3+4 -   3el on 6m / 4 el on 4m, on a 2.2m boom - 8.91dbi gain / 21.4dB f/b on 4m, 7.24dBi gain / 18.7db f/b on 6m. £199.99

4N6 5+5 -  5el on 4m / 5el on 6m on a 4.2m boom - 10.02dBi gain / 17.6 dB f/b on 4m, 10.04dBi gain, 29.06d/b f/b ratio on 6m. £259.99

A picture of the 5+5 antenna on the tower at the station of Vine Antennas MD, Ron Stone, GW3YDX, is shown in the picture that follows, underneath a 3 el SteppIR. Performance of the duobanders has been excellent, as expected. Polar diagrams are shown at the bottom of this page. VSWR is below 1.2:1 at the 70.2 and 50.1 design resonance points and below 1.5:1 on the most frequently used part of each band.

"Just FYI, managed to work JA on 6 this year using your prototype 6/4M (3+4) antenna, brilliant. 73 Tim M0AFJ"

5+5 4m plot shown above

5+5 6m plot shown above

3+4 4m plot shown above.

3+4 6m plot shown above