Forum Discussion
This is one of the reasons I do not like the Streaming Stick models.
That broken cable is the proprietary Long Range Wireless Receiver (LRWR). You can purchase another one of those cables from Roku for about $20.
https://www.roku.com/products/accessories
(USB Power Cable with Long-range Wi-Fi® Receiver)
Just need to make sure you get the right one for your model. (there is a different cable for the 3810 and 3820 models).
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If you are going to stay with the Streaming Stick, you may want to buy an extender cable (or get a short, free one from Roku) that will allow you to plug the cable into your HDMI port rather than the Stick so that cable isn't oriented in the manner in the pictures. (the weight of the receiver is tweaking that top mounted connection). https://my.roku.com/hdmi
If you go with a new set-top Roku device rather than the stick model, the micro-usb power cables can be found at any store for a few dollars as opposed to having to buy this LRWR cable directly from Roku.