[NLRS] 50Mhz antenna modeling question

[Glen Overby]

W0JT wrote:
> Since I am so frustrated by trying to work rovers that I can't hear and
> that can't hear me, I advocate "lots of antenna" when roving, rather than
> "the least antenna feasible". My "perfect" rover antennas would all be 10
> feet long so they were street legal when pointed in any direction, but

The MN road rules permit about a 1' overhang on the sides.  My 6m 3el beam
would not be legal on my car except when the antenna was turned sideways (it's
shorter than it is wide).  I don't remember how wide an F150 is, so it might
be legal.

With a 6m antenna, the real key is to get it 3m in the air.

Looking at the Directive Systems specs:

Freq	Gain	Ele	Length
902	14.5	11	36
	16.5	18	72
	18.5	33	144
	20	47	216

The jump from 18el to 33el is 2 dBi of gain, for antenna that takes a lot more
work to manage.  It looks better on 1296, where there is 3db gain from 25el to
45el.

I have a 6m Moxon on my list of antennas I want to build.  That will give some
gain, at the expense of directionality, but hopefully be light enough that I
can put it on a concentric-tube mast.

Glen, kc0iyt