I’ve always been a big fan of the Amazon Basics collection. This curtain rod has a very nice, clean look to it. Very easy to install, as it requires very little hardware. It comes at a fantastic price ($30) for the quality that you are getting. I found it works best for big windows or doors, as it compliments them very well.
The only downside it you have to make sure to get the brackets into studs or they can pop out of the wall. Other than that, I highly recommend this if you are looking to hang curtains above larger windows.