[TowerTalk] Vertical Moxon antenna for 40m field day
alwilliams at olywa.net
Mon Apr 17 13:23:17 EDT 2006
We are considering a 40m vertical moxon to augment our 3 element 40m wire beam for this year's field day. Here in the Pacific Northwest the beam at 65' elevation gives good gain and wide enough horizontal beamwidth to cover the easterly stations. However the low angle radiation is not so good. EZNEC shows the 40m vertical moxon to have pretty good gain (~9 dbi) down to about 2 degrees above horizon.
However I am concerned about the Brewster angle effect and that EZNEC may be ignoring it. In looking over a number of books and articles the discussion of the Brewster angle appears to be concerned with verticals working against ground. I am trying to determine if the Brewster angle effect for the Moxon negates the low angle radiation of the moxon. The 3 element beam is pretty good down to about 20 degrees or so.
>From these discussions and the web, it appears that the low angle radiation advantage shown by EZNEC is not going to be produced because of the brewster angle effect.
Has anyone tried the vertical moxon on 40m that can compare it to horizontal antenna at half wave height?
More information about the TowerTalk