[Elecraft] Urban stealth HF: Inside-the-backpack loop antenna?

[Dave New, N8SBE]

> Here's another idea.
>
> Run a wire inside your shirt from one cuff across your back and down to
> the other cuff.  Wrap loading coils around each arm just above the
> elbow.  Feed the "dipole" in the center at the back of your neck.
>
> I did a quick model (assuming your arms are held straight out) with 5.5
> feet total length and 2200 inductive ohms for each coil, with each coil
> 30% from their respective ends of the wire.  It "resonates" at around
> 14.15 MHz, but with only about 0.4 ohms real feedpoint impedance.  I
> assume it would take some sort of extra matching network to bring that
> up enough that a KX2 with the internal tuner could drive it.
>
> Ignoring the effect of a person's arm, another quick calculation says
> that the arm coils would need to be roughly 11 turns of 10 gauge wire
> 3.5 inches in diameter ... unless I made a mistake, which is quite
> possible.
>
> It would bring new meaning to the term "compromise antenna", but I bet
> it would be more effective than a super small loop the size of backpack
> frame.
>
> 73,
> Dave  AB7E

Wouldn't that be a 'scarecrow' antenna?

73,

-- Dave, N8SBE