3-Element 5/8 Collinear Antenna 1090Mhz.
........................................
The design for this antenna came from
(
http://www.tigereye.net.au/vk4ion/docs/VHF_UHF_antennas.pdf )
...See concept from Page32...fig 16.77 (Its a PDF extract from "The Radio Communication Handbook")
The 2-Element version has an quoted expected gain of around
6 to 7dbd../8 to 9 dbi.
The 3-Element version 8 to 9dbd ??
Built a couple 2-Element versions for VHF and its performance is impressive.
I had to lower the height of the VHF antenna as it gave my AR5000
to much gain to handle.
As for 1090Mhz I tryed/built 2 3 and 5 Element versions.
The 3 Element gave best results.
Even better distance than a basic 12 Element 1/2wave Collinear.
Height is the key of course for any antenna, and good quaility coax.
My setup consists of RTL(gain set to max) with fan cooling and metal case then a home built High pass filter then a 20db preamp (ZX60-P162N+) then long run of LMR400 coax to the 3 Element Collinear.
Will post the details (How too) of High Pass filter soon.
The RTL averages around 50 to 200 messg sec/3000 to 12000 messg a Min.
cheers Tony.