news 2014-05-18 22-39-24

Optimized 4-Element UHF Yagi antenna RE-A430Y4

The elements diameter of the antenna may vary between 5...10mm and the dipole diameter may
vary between 8...14mm (12mm recommended) without the need of changing anything to the length or spacing.
All elements except the dipole are electrically connected to the boom and may be mounted on top or through it.
The thickness/diameter of the boom may vary between 10...17mm.

The ideal SWR can vary a bit if the elements are isolated, raised from the boom or do to construction. A bit of experimentation with the driver length can solve this easily.
Bazooka (RF choke): you can also use a few ferrite beads placed over the coax directly behind the driver instead.



http://users.belgacom.net/hamradio/schemas/yagi_uhf_antenna.htm

2020-11-29_21-10-17
http://foto.prg.in.ua/md/dat/2020/2020-11-29_23-10-05_prg__YagiAntenna70-cm.pdf