Spent one interesting summer back in the eighties sometime dragging banners up and down the beachs from Santa Monica to Newport Dunes as well as around and around the colosium. Used Cessna 152's converted with 150 horsepower lycomings and extended range Flint tanks in the wingtips. It was always interesting passing under the departure path at LAX just off shore where departure control kept us under a two hundred foot cap.

Oh man sorry for the digression, its always fun remembering. Anyway back to what you are doing. First I have never pulled RC banner but have spent considerble time at both ends of a towline RC glider aerotowing. The one point I would like to point out is it is not really neccessary for you to use the full scale method of taking off with a secured grapple hook and then releasing for a pickup pass at a briddle line between poles. Typicallty in RC a banner is folded accordian fashion or rolled and with a rubber band or strap that is released in flight with a servo release thereby eliminating the problems of a briddle pickup, which is even more difficult in RC than full scale. Of course you do need a relase for the briddle leader line.

John