Another is called a "Doppler Direction Finder", and requires an
electronics package. It has 4 vertical antennas arranged in a square on
a metal plate. Take a look at
http://www.ramseyelectronics.com/cgi...dd=action&key=
DDF1
for an example of this kind of system. The vertical antennas might be
"rubber duckies" as well.

Fred
K4DII

I would also have a search for 'Handifinder', it is a simplified version of
the above that uses 2 small loop antennas and is easily hand portable. It is
cheap and easy to build and I think kits are available. It does have a 180
degree ambiguity but in real use that is not a great problem.

73
Jeff