theremin antenna design

[Paul Perry]

well RF is not my thing.....
so I wonder has anyone any idea for multiple theremin antennas?
I wondered if I had a horizontal plate say 10 cm diameter on the 
end of a pole with the outside of the pole earthed and the wire 
going up the pole, would this give reasonable isolation from 
another say 50cm away?
Does it matter at all what freq I am using, bearing in mind the
structure will be several orders of magnitude smaler than a wavelength?
Woulkd it be better to make some kind of balanced quadropoke structure
so it has a shaped near field but the signal dies away rapidly as you
move away from the unit?
Is the original 'classical' theremin structure optimal in some way?

So many questions, and only the ham radio handbook to guide me..
opinions anyone?

paul perry melbourne australia