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Unmanned aerial vehicle suspension banner deployment at a designated location is an extended application of the drone, which basically requires several conditions:
1 The remote control and receiver have spare idle channels.
2 The weight of the suspended items is balanced with the load capacity of the drone.
3 Depending on the condition of the item you are hanging, you can choose to control it with the remote control switch module or with the servo. 
As for the detailed production and debugging process, it is not a sentence that can be explained clearly. It definitely requires a certain amount of experience to complete, so I suggest that you still find a person or company familiar with the drone to help you complete. If you must complete it yourself, then I suggest you learn and explore more. Remember to pay attention to safety issues. At the beginning of the design, you should consider enough surplus power. When flying, you should fully consider the objective factors such as wind, vision, and crowd. Otherwise, The consequences will be very serious, fried chicken is a trivial matter, hurting talent is a terrible thing. 
This is an activity that we did a few days ago. I have also pulled a lot of banners before. Every time I feel that I am not very ideal. I have found some problems this time. I have summarized some points and maybe it will be better.
A web should cut some small holes in the gap of the word to remove the wind generated by the blade.
Second, at the bottom of the banner, it is better to be able to tie a steel bar with the same weight.
Third, you must know the maximum load of the aircraft. It is recommended to use a large aircraft, don't use elves and quick enlightenment.
The technology of the four flying hands must be too hard, and must be based on manual flight.
I hope this will help everyone. If you have any better way, please feel free to leave a message at the bottom, we will interact with you as soon as possible.
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