YU7EF 70 MHz Low Temperature Antennas

By Popa (Pop) Ljubisa, YU7EF

Below are data for a very good antenna for 4 m I designed some time a go. This one is still not published on my antenna presentation. Actually, this was initially designed for 6 m for YU4DP and he reported outstanding performance so I've decided to scale same design to 4 m and offer it to a ham community and as a very good choice that will work in all conditions.

However, on my site http://www.yu1arc.com/yu7ef you can find few other designs that can be of interest for 4 m.

Also, just recently I have sent another design to Joe DL8HCZ to be published in next DUBUS. It is 6 m/4 m duo band antenna that I have built. That one will be published in 1/2007 issue and also have made separate design for Joe of 7 + 8 element yagi for 6 m/4 m that Joe is going to build these days. Those dual band design are fed with only one coax - 4 m antenna is actually sleeve fed. Once they are published I will add them to my site as well.

Dimensions

All elements are made from 1/2" diameter tubes. Visit Pop's own webpage for alternative tube dimensions  http://www.yu1arc.com/yu7ef.

Azimuth plot.

Gain.

Impedance.

SWR.