Bamboo canes (1 or 2)
Some cable (zip) ties
A small handheld drill
Some tape (pvc electrical, or duct)
A junior hacksaw to cut bamboo pole to length (if needed)
A kite (I used a 2.4m2 cirrus kite)
A camera that can take a rough landing (I'm using a Kodak PlaySport outdoor camera, but GoPros would also work)
The basic theory is that kites produce quite a lot of lift, so adding a bit of extra camera weight shouldn't be too difficult.
Step 1: Bit of bamboo bracketry pt 1
So it seems to fit the bill well. The form of the bracket developed over the course of our experiments. We first tried with an X-brace configuration, but this was soon found to be too vulnerable during landing. The design was simplified to a single bamboo pole which ran between each of the power line bridles.
Before heading out, I made sure the poles were long enough. I needed poles of 1700mm for my 2.4m2 kite to adequately reach between the bridles.
To attach the pole to the bridle I drilled a hole through the pole and used a cable tie to attach it to the main power line (see photo). Do this at both ends to form a bamboo 'bar' across your power lines.