A:AnswerYou can certainly use a Fire stick, but maybe not powering it from the USB port of the TV itself. Unlike the Roku stick, the Fire stick seems to have higher current demands. I have only used the Fire stick with its own separate power supply, because of widespread warnings against powering it from the TV because of insufficient current from USB ports.. But also in my experience the the Roku stick works fine when powered from the TV's USB port.
A:AnswerBoth Roku and Fire sticks work. The Roku can be powered from the TV's USB port (I've done it with no problems). But the Fire stick should probably be powered from its own power supply, which is some what inconvenient, because of widespread warnings against powering it from a TV's USB port. Fire stick apparently has higher current demand than Roku stick. I don't know about any other devices..
A:AnswerTry connecting it to a known working source, like a PC, DVD/Blue Ray player, video game player, and try using different cables. This will let you know whether it is the connector, cable, or source.
A:AnswerYes, you can use it with an antenna to receive over-the-air broadcast TV channels. It will scan for channels when you set it up. The remote allows you to change channels. It does all of that just fine.
