ANY antenna above ground, has multiple lobes. You can simulate this with any program like MMANA or EZNEC... http://www.qrz.ru/schemes/contribute/arrl/chap3.pdf
Yes, and that is my point too.
To get the good gain at medium elevations from an omni, one need a large ground plane (screen, not radials) going out several wavelengths in all directions. In my emails I talk about being over a metal roof or large chicken wire ground plane to properly hide the real ground reflections and to block energy going down (which lose 3 dB) and hence all those high angle nulls.
Bob, WB4APR
-----Original Message----- From: AMSAT-BB [mailto:[email protected]] On Behalf Of Roland Zurmely via AMSAT-BB Sent: Wednesday, March 16, 2016 6:30 PM To: AMSAT Subject: [amsat-bb] 4 omni antennas plots (nulls)
Hi Bob WB4APR, ANY antenna above ground, has multiple lobes.You can simulate this with any program like MMANA or EZNEC... http://www.qrz.ru/schemes/contribute/arrl/chap3.pdf 73 de Roland PY4ZBZ
_______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb