[cgs1019]

I always wanted to try this! I imagined having two antennae, though, positioned orthogonally to give a 2-d signal.

[rch]

I used an old SWTP kit that had horizontal plates instead of antennae, but could still generally resolve 2-d movement.

Some details and images of what I started with:

http://www.theremin.us/144/144.htm