4 quadrotors could hold an advert in the air statically, near heavy pedestrian areas.
Anyone think this idea holds any merit?
* If you fly too low this is a hazard to road traffic * You may be too close to construction sites * Radio frequency may need to be licensed for that day/time/area * General liability
Lastly -- I think it becomes a target practice for kids and people who hate this kind of advertising in general.
You could use a balloon maybe instead.
Make sure you print on BOTH sides of the ad so the people in the buildings above can see it too.
You'd also want to augment the quads so that when they reach a low battery threshold, they return to the rooftop automatically for new batteries or a new ad.
To ensure they don't collide, you could use simple IR transceivers on the sides of the quads to allow them to maintain optimal distance at all times.
Finally, if you want to get REALLY creative, you could adapt gyros to the quads to allow them to stay perfectly still, even in high winds.
Rain would now be your biggest foe.