There is actually no secret or "right" way to
hang them. Whatever works for you is the way to go.
The Banners are 12 ft. tall with an additional 5 ft. of hanging part ending with
a fabric star. (We have added smaller ones since this was written) There is a slot going up one side for 12 ft. that will take a pole of up to 1" diameter.
The best material is bamboo - it's very strong and it flexes just right to
give a graceful bend to the banner. You would want a piece that's about 14
ft. long - 12 ft. to fill the banner and 2 ft. to plant in the ground. If the
bamboo is sharp at the top, blunt it with some tape. Of course, bamboo is hard
to find (unless you are reading this in Asia), but it is available.

Another choice is white plastic
PVC pipe. The thicker, up to 1 diameter, the less bend you get. It kind of
depends on the strength of the wind where the banner will be displayed and the
effect you want. PVC is cheap and available everywhere. We used 3/4" pipe
in the photos we took. One idea for planting in soil is to use a 1" piece
of PVC, cut it off at an angle on one end, say 2 ft. long, and then drive that
sarp end into the ground with a hammer. Then you can slide the 3/4" pipe
into the planted bigger pipe.
Another possibility is wood - a 14 ft piece of 1" x 1". Probably less
desirable and more likely to snap.
In high wind area you could use metal pipe like galvanized water pipe but you
get no bend. Also possible is 1" PVC which is pretty stiff and not going to
bend much.
If you are not putting the banners into the earth, then it's best to
improvise a way of tying them to a fixed object. You can poke a hole in the
banner in the slot and run a wire or string around the pole and to a fixed
object in a couple of places.