Here are instructions to do some basic hacks to the theremin kit that you can buy from Make
. True, there are already directions to do both of these things in the accompanying magazine, but what sets this how-to apart is that it is in English. If like me you can't read Japanese and unlike me, you couldn't figure out what to do from the pictures alone, this should help.
Basically, what I am doing is adding an audio out jack and also a bigger, sturdier telescoping antenna. This is a great improvement on the original.