[VHFcontesting] Yagiphobia, Confusion and Infusion

[K8TB]

The main disadvantage of a 4 bay omni is lthat you will pick up any QRN 
located anywhere. But a 4 bay absolutely has gain on the horizon. A 4 
bay would have the proverbial  6 Db of gain, minus splitter/feedline and 
connector losses. What the 4 bay does is squash the donut flatter, and 
out. My day job depends on this (radio broadcast engineer with 5 FM 
transmitter sites).
     I plan to put up a 4 bay omni for six at my remote base site. Then 
I switch over to the very quiet Innovative beam.
We all should look at more of these antennas, but, to obtain the full 3 
Db gain per doubling, you need to space the bays a full wave length, 
which is 20 feet. So the 4 bay would be 60 feet, bay 1 to bay 4. You can 
get by with half-wave spacing, with less gain.

Tom Bosscher K8TB




On 9/17/2013 9:47 PM, John Geiger wrote:
> If you stack 4 of those elements, and it is omnidirectional, then the 
> gain has to come from somewhere. Where does it come from?  It would 
> probably compress the take off angle, but in terms of beamwidth gain 
> relative to a Yagi, it couldn't have any.
>
> It wouldn't allow you to null out noise coming from a specific 
> direction, which can be useful also.
>