We used to plant about 125 running feet of a small red vining flower that attracted humming birds. We let them climb on the 16' long hog or cattle fence panels the farm stores sell. The hummers really liked them. The plants were an impressive sight, but the feeders were a strong attraction as well.
I can't remember the name of those flowers but every night all the flowers dropped off and every morning new ones opened up. Wife is out now but upon return she will know and I will post the variety.
Also, we've seen birds show up just before dawn and even in the rain and near dark. Humans aren't looking then and may not see the bird coming around.