Guess' for control:
1. A resisting flex seonsor allowing for the approximate bend of the antenna to be read.
2. A camera that looks for a "green blob" on the end.
and coolest (but least likely)...
3. Your using a fiber-optics cable and analyzing the light distortion to find how your bent!!!!

__________________
What? You guys still opperate in only
2 dimensions?
This is a BEAR, it saves you.
Ghoti is pronounced "fish," ain't that sumthin'?