Heres a couple ways. if you have the room on a walls you can make a frame out of wood that the banner can be stapled to then hung like a picture. if you don't have the room on the walls, witch most of us do not .
I made a frame, after measuring the 22" apart rafters, made it just a little bigger then the banner, with two pieces 1 1/2 " going accross for support, then put styro-foam with a hot glue gun in between the supports. Then you can buy rubber spray glue in the can. spray the hole thing an lay the banner on the glue and hand rub it, once the glue has dried. pre drilled screw holes at the marks for the rafter, start the screws, considering the thinkness of the sheet rock also. it takes two to hang it. I also have a couple of company flags on the ceiling, along with some posters. Now if your going to keep these items in your collection till you die, you can have your lovley Helga put a little starch on them an iron them , staple them on the frame then you can put a sealer on them. good luck.