You could run the cam with batteries or an
adapter with plenty of headphone extension
cords. Try to solve the problem of signal
degradation by pointing both antennas
straight up. This helps with multiple
camera setups when it is impossible to get
all ants pointed at each other. I doubt it
will work if you are constantly moving, but
if you put the reciever as close as you can
to the transmitter say, under the center of
the stage, you may have a chance. Then
point the cameras ant. straight down. There
is a cable of unknown conductors connecting
the base of the camera to the antenna. If
you could splice and extend this wire
without the performer tripping over it,
maybe you can keep the antenna stable while
still moving the camera.