Tom, I don't know why it didn't work for you. I am being totally serious when I tell you that it DOES work. There is a limit to the distance that it will boost the signal, but it does help.

To clarify; I have the stock VX alarm system and key fob. If I place the tip of the fob (that I usually point at the car) against my temple and then press the arm/disarm button it can, sometimes, triple the distance that I can arm/disarm the alarm from. Some have had some luck with placing the fob under their jaw (in the squishy part).

Could also be that your head just isn't a good conductor.