On Thursday, November 6, 2014 1:46:04 PM UTC-6,

We are still faced with the issue of matching a 50 Ohm transmitter
to a 2 Ohm antenna, but for now I am more interested in seeing if
there is some way to further increase the antenna impedance.

Maybe a caged monopole? I've never tried anything like this myself,
but you might find this kind of interesting.

http://www.kintronic.com/resources/t...alPapers/2.pdf