How's everyone. I used to tow banners in real airplanes as well. I also tow with R/C, exactly how the real ones do it. I have a setup on an ultra stick to deploy a hook (I modified a fishing hook), I "swoop down" and catch the banner. Then, before i land, I release it. I took a video of it flying. Let me know if anyone has questions on my setup. Here is the link to my video. I am towing a twin-sized bedsheet with a 1.60 FX (standard muffler, with a climb prop). It acts very scale with the banner. Here is my video taken about 6 months ago.
http://www.youtube.com/watch?v=cDcF0S3UhhQ