"I'm actually working on this myself... Just find a LED battery monitor and stick it somewhere that can be seen with your camera.

This example: http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXHDJ2&P=ML isn't perfect because it's made for receiver…"

"Do you have an Amateur Radio license? With out one, I don't think you'll be able to achieve this goal with unlicensed spectrum."