Boingk, you need specialist equipment fitted to the aircraft (sprung hook and cable release) so for a one-off, it would be complicated and expensive.
In France we do loads of banner towing in the summer and there are plenty of training courses for it.
You can tow with a microlight, there are people using skyrangers and savannahs to do it.
If you have good short takeoff performance, then you don't need to do the aerial pickup manoeuvre which is difficult and not without it's dangers.
What most here do is the following:
Position the aircraft at the threshold of a private strip and shut down.
Attach the rope to the hook and lay the rope and banner out in front of and to the left of the aircraft.
Climb in, start up and repeat engine checks etc.
Perform a short field takeoff, get airborne before the banner starts to lift.
Climb at Vx until the banner starts to drag.
Level off to slower angle of climb with the banner.
The rope is normally about 100m long, so you can go almost 200m before the banner starts to lift.
With the right aircraft it's fairly straightforward, but needs some planning and preparation.
Hope that helps.
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