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

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