[amsat-bb] dual band vhf/uhf antenna

[Ev Tupis]

 Hi Jackie,
Same-plane antennas work nicely, as long as they are designed with that in mind. See multi-band same-plane yagi examples in the HF world.  Kent is a skilled designer who both engineers *and* pretests before publication.

Simply interlacing antenna elements for different bands without taking into account their mutual interaction invites problems.
Arrow gets around that by placing different bands in different planes.

Ev, W2EV


    On Sunday, February 16, 2020, 7:08:34 AM EST, Jackie Dander via AMSAT-BB <amsat-bb at amsat.org> wrote:  
 
 I built the combination dual band 2meter/70cm antenna found at WA5VJB's
webpages. I chose the 5 elements on UHF forward and 2 elements on VHF rear.
All elements are in the same plane.
I now read elsewhere that in-same-plane uhf/vhf elements can interfere with
each other. I visited the Arrow website and see their LEO antennas are
opposing for uhf/vhf.
My question is if i made a mistake building the uni-plane version? Why did
WA5VJB has such success?
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